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  • 1. Björkdahl Sundling, Catherine
    et al.
    Berglund, Birgitta
    Nilsson, Mats
    Emardson, Ragne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    New perspective on the accessibility of railway transport for the vulnerable traveller.2013Inngår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 459, nr 1, s. 12021-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Vulnerable travellers experience various problems in the transport environment. These may reduce public travel confidence and consequently lead to decreased mobility. A goal of our research is to find out how to improve the accessibility to railway travelling, especially, for persons with functional limitations. By reducing barriers, the ability of travelling would be improved, and consequently allow for more flexible travel behaviors. In order to develop a model and a method of measurement for accessibility, we (a) constructed a reference group of representative ‘typical older persons’ (65-85 years) from questionnaire data, and (b) developed an accessibility measure for persons with functional limitations. In this measure barriers have different weights for the different persons depending on their functional ability and travel behavior. This gives the probability of facing a certain barrier when travelling to a certain destination; that is, a measure of accessibility for the individual. The more weight placed on a certain barrier, the less probable it is that the particular journey will take place. These weights will be obtained in forthcoming research on the perception of a set of various travel scenarios representing barriers.

  • 2.
    Börjesson, Lars
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Simulated loading of vehicle scales.1989Rapport (Fagfellevurdert)
  • 3.
    Cano, Stefan J
    et al.
    Modus Outcomes, UK.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Barbic, Skye P
    University of British Columbia, Canada.
    Fisher Jr, William P
    University of California, USA.
    Patient-centred outcome metrology for healthcare decision-making2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Valid and precise quantification of clinical variables is essential for appropriate interpretation to inform healthcare decision making. The outcomes produced from different measurement procedures and instruments, purporting to quantify the same measurand, should be directly comparable. This ensures the appropriate application and widespread adoption of clinical research findings. Metrology provides a framework for the development of a common language of reference measurement systems, which have the potential to improve the accuracy and comparability of patients’ results. However, the practices, procedures and instruments used in social measurement are currently excluded from any formal metrological framework. In this paper, we build on previous arguments, and propose a new international body to bring together metrology, psychometrics, philosophy, and clinical management to support the global comparability and equivalence of measurement results in patient centred outcome measurement to improve healthcare.

  • 4.
    Cano, Stefan
    et al.
    Modus Outcomes, UK.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Melin, Jeanette
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Fisher, William
    University of California, US.
    Towards consensus measurement standards for patient-centered outcomes2019Inngår i: Measurement, Vol. 141, s. 62-69Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Patient centered outcomes pertain to a patient's beliefs, opinions and needs in conjunction with a clinician's medical expertise and assessment. The rise of patient-centered outcome (PCO) measurement parallels increased interest in patient-centered care. PCO measures offer the opportunity for more meaningful measurement of health outcomes informative enough to guide treatment decisions. However, it has been suggested that, for practical and scientific reasons, existing PCO measures are currently not capable of delivering the kind of quality assured measurement required for high-stakes decision making. Potential solutions include: addressing the lack of units in PCO measurement through recourse to mathematical models devised to define meaningful, invariant, and additive units of measurement with known uncertainties; establishing coordinated international networks of key stakeholders guided by five principles (i.e., collaboration, alignment, integration, innovation and communication); better use of technology leveraging measurement through item banks linking PCO reports via common items, common patients, or specification equations based in strong explanatory theory. And finally ensuring PCO measurement always is associated with: (1) a clear definition of the measurand in regards to the intended clinical use; (2) a clear definition of the clinically allowable error of measurement; (3) international cooperation and consensus to navigate the complexities of the development of metrologically sound reference measurement systems; and (4) continued clinical validation of newly calibrated measures. In this article, we illustrate the principles to improve PCO measures with examples from breast cancer, vision-related patient-reported outcome measures, and dementia clinician-reported and performance outcome measures.

  • 5. Davis, RS
    et al.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Intercomparison of magnetic properties of mass standards2001Konferansepaper (Annet vitenskapelig)
  • 6.
    Falnes Olsen, Åge Andreas
    et al.
    Norwegian Metrology Service, Norway.
    Karlsson, Helge
    Norwegian Metrology Service, Norway.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Conformance assessment of electrical energy meters investigated by risk analysis – a case study2016Inngår i: OIML Bulletin, Vol. 57, nr 2, s. 5-20Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    This paper presents a case study of more effective decision rules for the conformance assessment of electrical energy meters in private households in Norway, and proposes how to use a specific risk analysis in order to set the time for the next meter test. The MID regulation today prescribes conformance assessment of electrical energy meters based on ISO standards for attribute sampling where decision rules are purely statistical decision rules and economic consequences are not explicitly taken into account. The risk analysis we introduce calculates the risks involved for erroneous decisions, either rejecting a conforming batch of meters (the producer risk) or accepting a non-conforming batch (the consumer risk). The consumer risk is sensitive to the period until the next test which becomes a quality characteristic of each batch. This time interval can be optimized by balancing the consumer risk against the producer risk. When the quality drops, the period until the next test will need to become shorter. But at a certain level of quality, the energy net supplier would rather replace the complete batch, than continue testing at such short intervals.

  • 7. Fang, H
    et al.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Optical heterodyne refractometry of water vapour in the microwave range”2001Konferansepaper (Annet vitenskapelig)
  • 8.
    Gutfelt, Bengt
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Johansson, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Nyfeldt, Per
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    13th Comparison between the Swedish national kilogram and SP principal standards for one kilogram2014Rapport (Fagfellevurdert)
  • 9.
    Ivarsson, Sven
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Johansson, Bengt
    Källgren, Håkan
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Calibration of submultiples of the kilogram.1989Rapport (Fagfellevurdert)
  • 10.
    Ivarsson, Sven
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Johansson, Bengt
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Intercomparison of measurement techniques on small masses. Euromet project A88/143.1989Rapport (Fagfellevurdert)
  • 11.
    Jacobsson, Ulf
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Johansson, Bengt
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    12th comparison between the Swedish National Kilogram and SP's principal kilogram mass standards.2004Rapport (Fagfellevurdert)
    Abstract [en]

    The 12th comparison between the Swedish National Platinum-Iridium kilogram (Proto¬type number 40) and the principal kilogram standards for mass has been performed at SP Swedish National Testing and Research Institute. The method used was a weighted least square method with restraint developed by Dr Leslie Pendrill < >. Weighings for the pan-European key intercomparisons for 1 kg, EUROMET 509 and 510 were made together with the regular kilogram comparison.

  • 12.
    Jacobsson, Ulf
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Thor, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Determination of the magnetic properties of mass standards.2004Rapport (Fagfellevurdert)
    Abstract [en]

    Magnetic forces can adversely affect weighings since, without systematic investigation, these spurious forces cannot be distinguished from the gravitational forces to be compared in the determination of mass. Magnetic forces can result from the mutual interaction of two mass standards as well as between a mass standard and the mass comparator being used for the weighing. Magnetic forces arise in the influence of a magnetic field gradient on a mass standard possessing a magnetic dipole moment; the latter may either exist permanently or may be induced by the applied magnetic field. This report summarises the effects of magnetism in weighing and methods developed to determine the magnetic properties of mass standard and comparator.

  • 13.
    Johansson, Bengt
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Källgren, Håkan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    11th comparison between the Swedish national kilogram and SP principal standards for one kilogram.1996Rapport (Fagfellevurdert)
  • 14.
    Kanerva Rice, Sophie
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Petersson, Niclas
    RISE - Research Institutes of Sweden.
    Nordlinder, Jesper
    SCA Hygiene Products AB, Sweden.
    Farbrot, Anne
    SCA Hygiene Products AB, Sweden.
    Rationale and Design of a Novel Method to Assess the Usability of Body-Worn Absorbent Incontinence Care Products by Caregivers2018Inngår i: Journal of Wound, Ostomy and Continence Nursing (WOCN), ISSN 1071-5754, E-ISSN 1528-3976, Vol. 45, nr 5, s. 456-464Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    PURPOSE: The purpose of this study was to develop and test a new method to measure the usability of absorbent incontinence care products from the caregivers' perspective and to investigate if the method can be used to differentiate between product types in a product change.

    DESIGN: Process evaluation and validation study.

    SUBJECTS AND SETTING: Product developers and end users participated in designing the new method. Thereafter, professional caregivers acted as testers of the new method, ranking usability when performing absorbent product changes on patients in a simulated nursing home care environment, assisted by third-party research institute moderators.

    METHODS: Design and evaluation of a new method designed to assess the usability of body-worn absorbent incontinence care products for lay caregivers were completed. The evaluation included formative and summative evaluations of effectiveness (product fit), efficiency (time and physical workload), and satisfaction. A person-centered approach aimed at including all subjects and settings to generate a single usability score for decision making and product benchmarking. Experienced caregivers changed 4 types of products: (1) disposable body-worn pads with mesh briefs (2-piece system); (2) disposable all-in-one briefs; (3) disposable, T-shaped, and belted brief; and (4) disposable pull-up pants on simulated patients in standing or lying position. Each product change was performed by 1 unassisted experienced caregiver. The probability of success as a score for each product type was calculated across the 4 metrics and reported with 95% confidence intervals (CIs). Descriptive and inferential statistics were developed assuming a binary statistical model, using the weighted scores from each of the factors. An overall usability score was calculated.

    RESULTS: The method we developed discriminated between usability of different product types. The overall score for the disposable pull-up product (90%; CI: 83%-97%) was better (P < .05) than for the disposable T-shaped brief (83%; CI: 77%-89%), the disposable brief (53%; CI: 45%-61%), and the disposable body-worn pad with mesh pant (61%; CI: 56%-66%) in standing patients. For lying patients, the overall score for the disposable T-shaped brief product (81%; CI: 73%-89% was better (P < .05) than the disposable brief (65%; CI: 45%-61%) and the disposable body-worn pads with mesh brief (62%; CI: 55%-69%). Reliability was evaluated quantitatively in terms of measurement uncertainties in the results.

    CONCLUSION: The method we described demonstrated differentiation of usability based on product type indicating concurrent validity. Further testing in diverse real-world care environments is needed to evaluate and confirm the validity and to assess reliability of this method in the research setting.

  • 15.
    Källgren, Håkan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Requirements on weighing in legal metrology.2003Inngår i: Metrologia, Vol. 40, s. 316-323Artikkel i tidsskrift (Fagfellevurdert)
  • 16.
    Källgren, Håkan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Magnusson, Bertil
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Role of measurement uncertainty in conformity assessment in legal metrology and trade2003Inngår i: Accreditation and Quality Assurance, Vol. 8, s. 541–547-Artikkel i tidsskrift (Fagfellevurdert)
  • 17.
    Mari, Luca
    et al.
    Università Cattaneo LIUC, Italy.
    Ehrlich, Charles
    NIST National Institute of Standards and Technology, USA.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Measurement units as quantities of objects or values of quantities: a discussion2018Inngår i: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 55, nr 5, s. 716-721Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Measurement units have historically been defined as quantities (i.e., specific properties) of objects, such as the mass of a particular piece of metal or the length of a particular rod. While the current International System of Units (SI) Brochure endorses this position, the draft 9th SI Brochure proposes to change it, and instead define measurement units as values of quantities. The reason for this proposed change is not provided, but it does not seem plausible that it is related to the redefinition of the SI units in terms of fundamental constants of nature: the very concept of what a unit is does not depend on the concrete way any given unit is defined. This paper is intended to open a discussion of whether measurement units should be defined as quantities or as quantity values, and provides our rationale for maintaining the definition of units as quantities.

  • 18.
    Melin, Jeanette
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Fornazar, Robin
    University of Gothenburg, Sweden.
    Spångfors, Martin
    Lund University, Sweden; Kristianstad Hospital, Sweden.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Rasch analysis of the Patient Participation in Rehabilitation Questionnaire (PPRQ)2019Inngår i: Journal of Evaluation In Clinical Practice, ISSN 1356-1294, E-ISSN 1365-2753Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objective: To evaluate the Patient Participation in Rehabilitation Questionnaire (PPRQ) according to Rasch measurement theory. Method: Five hundred twenty-two post-discharge patients from a neurological rehabilitation unit were included. The PPRQ questionnaire comprises 20 items rated by a cohort of 522 patients about their experiences of participating in rehabilitation. The measurement properties of the PPRQ were evaluated by Rasch analysis of the responses. Results: The Rasch analysis of 20 items showed some major misfits, particularly three items addressing the involvement of family members. After removing those items, the model fit improved and no significant DIF remained. Despite improvements, person values (−2.96 to 4.86 logits) were not fully matched by the item values (−0.61 to 0.77 logits). Neither did the t test for unidimensionality meet the criterion of 5%, and local dependency was present. The unidimensionality and local dependency could, however, be accommodated for by four testlets. Conclusion: The PPRQ-17 showed that a ruler with a reasonable and clinical hierarchy can be constructed, although the expectations of dimensionality and local dependency need to be evaluated further. Despite room for further development, PPRQ-17 nevertheless shows improved measurement precision in terms of patient leniency compared with previous evaluations with classical test theory. In turn, this can play a crucial role when comparing different rehabilitation programs and planning tailored care development activities.

  • 19.
    Melin, Jeanette
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Quality assurance of cognitive assessments and other categorical data2019Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Did you ever wonder how to account for biases such as ceiling eects in your (cognitive) data?

    Metrological quality assurance of human-based responses is in its infancy and analyzing categorial data and other human responses is challenging. However, there is a need to tackle those challenges to ensure that decisions about health care are made correctly. Quality assured comparability, interoperability and decision-making can successfully be done by applying sound metrological approaches to enable traceability as well as stressing declaration of measurement uncertainties. In the seminar, we present metrological approaches to ensure quality assurance of categorical data,such as cognitive assessments and other human-reported responses. This is followed by a hands-onworkshop where you are welcome to bring your own or freely available data for analyses.

  • 20.
    Melin, Jeanette
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Cano, Stefan
    Modus Outcome, Uk.
    NeuroMET Memory Metric version 0.12019Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Alongside a lack clinically validated, minimally invasive diagnostic tools for early diagnosis and/or monitoring of disease progression in Alzheimer’s Disease (AD), there are no sound metrological assessment protocols and measurements for cognition, nor measurement comparability through SI (System of International Units), traceability and uncertainty for regulatory approval of biomarkers. As part of the on-going EMPIR HLT04 NeuroMET project in which several national metrology institutes work together with clinicians and academics to overcome specific measurement issues to improve diagnosis and disease progression, we describe here the justification for and development of the ‘NeuroMET Memory Metric’ (version 0.1).

    Re-examination of traditional widely used ‘legacy’ cognitive assessment protocols using invariant measurement theory aims at more accurately capturing the patient’s cognitive ability and improving the analysis of correlations with various AD biomarkers. Two principal elements provide sound metrological underpinnings: (i) a correct formulation of a measurement model; and (ii) proper handling of the ordinal cognitive data. In turn, this enables formulation of novel construct specification equations for patient cognitive ability as a function of diverse biomarkers (e.g., in plasma, CSF and saliva together with MRI/MRS data) as well as for cognitive task difficult as a function of test design.

    To further improve the accuracy in patient’s cognitive ability work is now in progress to develop a NeuroMET Memory Metric based on legacy cognitive assessments (e.g., MMSE, Corsi Block Test, Digital Span Test). This work can be ascribed a level-5 construct theory. This means the realization of more fit-for-purpose, better targeted and better administered cognitive measurement systems. It will also enable traceable calibration of both additional cognitive tasks as well as the effects of intervention (or disease progression) on the cognitive ability of each individual patient.

  • 21.
    Music, Haris
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Simple and economic optical high-speed photo-detector ac response determination method in the 850 nm spectral range2004Inngår i: Measurement science and technology, Vol. 15, s. 1702-8Artikkel i tidsskrift (Fagfellevurdert)
  • 22.
    Music, Haris
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Spectral line narrowing of a photonically generated frequency comb with vertical-cavity surface-emitting laser mode-locked coupled oscillators.2004Inngår i: Optics letters, Vol. 30, nr 3, s. 266-268Artikkel i tidsskrift (Fagfellevurdert)
  • 23. NeuroMET constorium, EMPIR HLT04
    et al.
    Melin, Jeanette
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Innovative measurements for improved diagnosis and management of neurodegenerative diseases2019Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Development of novel therapies for Alzheimer’s Disease (AD) is constrained by the lack of available methods for preclinical diagnosis, despite extensive research on biomarker identification. The EMPIR NeuroMET project unites National Measurement Laboratories, clinicians and academics, to overcome limitations in measurement methods and provide a better understanding of how to improve, combine and analyse measurements in AD diagnosis and treatment. Comparability through SI (System of International Units) traceability and uncertainty analysis is an, as yet, unmet requirement for regulatory approval of biomarkers, patient centred outcome measures, clinical thresholds and new therapeutic drugs. We will report on:

    • Multimodal statistical analysis on blood, CSF and saliva biomarkers data from the NeuroMET cohort generated by using mass spectroscopy and immunoassay platforms, including a novel immunoassay approach to overcome matrix effects when relative quantification is not sensitive enough. A new digital PCR approach was developed to assess microRNAs quantities in blood to compare with established biomarkers.
    • Progress towards the development of mass spectrometry reference measurement procedures traceable to the SI for t-tau and α-synuclein in cerebrospinal fluids.
    • Development of ultrahigh field Magnetic Resonance Imaging and Spectroscopy protocols for increased spatial and spectral resolution and decreased uncertainty, and their application to the NeuroMET cohort.
    • Improved cognitive assessment protocols, with improved metrological evaluation of cognitive performance scores and the development of construct specification equations for various cognitive protocols and biomarkers.
    • Potential relationships between volumes of AD-related brain structures and neurometabolite concentrations with measured cognitive function.

    Improved reference methods to underpin the production of calibrators and improve measurement comparability of established biomarkers has the potential to further the understanding of AD and boost research for disease modifying therapies.

  • 24.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    A Conversation with Leslie Pendrill, SP Technical Research Institute of Sweden and EURAMET2010Inngår i: MEASURE, Vol. 5, nr 1, s. 21-7Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Prof. Leslie Pendrill has been the Head of Research of the Measurement Division at the SP Technical Research Institute of Sweden since 1985. His research work is concerned with fundamental metrology, in particular optoelectronic, laser, length, and mass measurements, while his applied metrology activities include optimized measurement uncertainty studies and the measurement of perception. He is actively involved in several internationalmetrology activities, holding leading roles such as currently the 2009–2012 Chair of the European Association of NationalMetrology Institutes (EURAMET) and earlier as Chair (2006–2008) of the International Union of Pure and Applied Physics (IUPAP) Commission on Symbols, Units, Nomenclature, Atomic Masses and Fundamental Constants (SUNAMCO). He has just become a member of the NCSLI Board as EURAMET Representative.

  • 25.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A review of education in measurement technology and metrology.1993Rapport (Fagfellevurdert)
  • 26.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Assuring measurement quality in person-centred healthcare2018Inngår i: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 29, nr 3, s. 034003-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Is it realistic to aspire to the same kind of quality-assurance of measurement in person-centred care, currently being implemented in healthcare globally, as is established in the physical sciences and engineering? Ensuring metrological comparability (‘traceability’) and reliably declaring measurement uncertainty when assessing patient ability or increased social capital are however challenging for subjective measurements often characterised by large dispersion. Drawing simple analogies between ‘instruments’ in the social sciences – questionnaires, ability tests, etc.–  and  engineering instruments such as thermometers does not go far enough. A possible way forward apparently equally applicable to both physical and social measurement, seems to be to model inferences in terms performance metrics of a measurement system. Person-centred care needs person-centred measurement and a full picture of the measurement process when Man acts as a measurement instrument is given in the present paper. This complements previous work by presenting the process, step by step, from the observed indication (e.g. probability of success, Psuccess, of achieving atask), through restitution with Rasch Measurement Theory, to the measurand (e.g. task difficulty). Rasch invariant measure theory can yield quantities –‘latent’ (or ‘explanatory’) variables such as task challenge or person ability – with characteristics akin to those of physical quantities. Metrological references for comparability via traceability and reliable estimates ofuncertainty and decision risks are then in reach even for perceptive measurements (and other qualitative properties). As a case study, the person-centred measurement of cognitive ability is examined, as part of the EUproject EMPIR 15HLT04 NeuroMet, for Alzheimer’s, where better analysis of correlations with brain atrophy is enabled thanks to the Rasch metrological approach.

  • 27.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Assuring quality in person-centred healthcare2017Konferansepaper (Annet vitenskapelig)
  • 28.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Calibration of submultiples of the kilogram: Weighted least squares analysis of data from weight set NPL W43. Rev. utg. 1993. Euromet project 231.1992Rapport (Fagfellevurdert)
  • 29.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Cooperation CEN-CENELEC/EURAMET2010Inngår i: CEN-CENELEC/EURAMET CA signing, CEN-CENELEC , 2010, , s. 12Konferansepaper (Annet vitenskapelig)
  • 30.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Cooperation EURAMET: WELMEC2010Inngår i: WELMEC Committee meeting, Bled (SLO), WELMEC , 2010, , s. 10Konferansepaper (Annet vitenskapelig)
  • 31.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Density of moist air monitored by laser refractometry.1988Rapport (Fagfellevurdert)
  • 32.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Development of European Metrology2010Rapport (Fagfellevurdert)
  • 33.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    El ser humano como instrumento de medida2014Inngår i: e-medida. Revista Española de Metrología, Vol. 7, nr 4, s. 21-39Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Demands for quality assured measurement are increasing, not only from sectors such as health care, services and safety, where the human factor is obvious, but also from manufacturers of traditional technical products of all kinds who realize the need to assure the quality of their products as perceived by the customer. The metrology of human-based observations is however in its infancy. This article reviews how this can be tackled with a measurement system analysis approach, particularly where Man acts as a measurement instrument. Connecting decision risks when handling qualitative observations with information theory, perceptive choice and generalized linear modelling – through the Rasch invariant measure approach – enables a proper treatment of ordinal data and a clear separation of person and item attribute estimates. This leads in turn to opportunities of establishing measurement references, and the metrological quality assurance that is urgently needed in many contemporary applications.

  • 34.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    EURAMET: European Association of National Metrology Institutes2009Inngår i: Measure, Vol. 4, nr 4, s. 40-5Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Intensified cooperation amongst the national metrology institutes of Europe in all their fields of activity, from metrological research to calibration services, is a response to increased needs of society for traceable measurement, not only in the traditional areas (trade, manufacturing) but also in meeting the ‘Grand Challenges’ of modern society, such as Energy & the Environment; Health and Security, often in combination with the enabling technologies. European metrology had been coordinated successfully since 1987 by the European Association of National Metrology Institutes (EUROMET) but with increased integration of national programmes, a change of organisational form became necessary and since 2007 EURAMET e.V. is its successor as the Regional Metrology Organisation (RMO) of Europe.

  • 35.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    EURAMET Report to AFRIMETS2010Rapport (Fagfellevurdert)
  • 36.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    European metrology stakeholders consultation2003Rapport (Fagfellevurdert)
  • 37.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    European metrology strategy for smart, sustainable and inclusive Growth2010Rapport (Fagfellevurdert)
  • 38.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Forskningsnätverk för tillämpad sensorutveckling och mätteknik2000Rapport (Fagfellevurdert)
  • 39.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Fundamental metrology at SP. (Reprinted from Physica scripta, 41, 733-736 (1990).1990Rapport (Fagfellevurdert)
  • 40.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Fysikavund – släpp det!2016Inngår i: Svenska FysikersamfundetArtikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 41.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    How to calibrate a questionnaire: quality-assuring categorical data with psychometric measurement theory2018Inngår i: / [ed] Charité, 2018Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Measurements in the social sciences – with ‘instruments’ such as questionnaires, ability tests, – in education, healthcare and so on, need metrological quality assurance. A patient, for instance, expects the same quality of care wherever and whenever provided. This is a challenge since the usual tools of statistics do not always work on the categorical scales typical of such measurements. Modelling a measurement system where the instrument is a human being, and where the output is a performance metric, i.e., how well the set-up performs an assessment, appears to be a way forward. This BEMC Colloquium will present the necessary tools, such as psychometric Rasch measurement theory, and will be followed by a hands-on workshop where you yourselves can analyse cases such as (i) the Quality of the BEMC Colloquium Series and (ii) a Healthy Lifestyle.

  • 42.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Introductory Guide to Nanometrology2012Rapport (Fagfellevurdert)
  • 43.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Lasermätstation för upprätthållande av längdenheten.1988Rapport (Fagfellevurdert)
  • 44.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Limits to the reliability of the Rasch psychometric model2017Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Metrological assurance of qualitative evaluations, such as made by a person acting as a Measurement Instrument (e.g. in person-centred care) seems to be possible using a generalised linear model specifically based on the Rasch psychometric approach. Traditional classical test theory and many of the usual tools of statistics cannot work reliably on ordinal or nominal scales typical of person responses, rating questionnaires or other qualitative evaluations. This talk recalls how to establish metrological references (item banks of task difficulty, for example) and uncertainty budgets for categorical data (using informational entropy). New insight will then be given into how the reliability of subjective measurement systems and the Rasch model can be evaluated with respect to measurement scale shift and scale stretching with novel tools analysing rating scores and logistic regression residuals. Examples will range from physical rehabilitation to cognitive assessment.

  • 45.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Man as a Measurement Instrument2014Inngår i: NCSLI Measure J. Meas. Sci., ISSN 1931-5775, Vol. 9, nr 4, s. 24-35Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Demands for quality assured measurement are increasing, not only from sectors such as health care, services and safety, where the human factor is obvious, but also from manufacturers of traditional technical products of all kinds who realize the need to assure the quality of their products as perceived by the customer. The metrology of human-based observations is however in its infancy. This article reviews how this can be tackled with a measurement system analysis approach, particularly where Man acts as a measurement instrument. Connecting decision risks when handling qualitative observations with information theory, perceptive choice and generalized linear modelling – through the Rasch invariant measure approach – enables a proper treatment of ordinal data and a clear separation of person and item attribute estimates. This leads in turn to opportunities of establishing measurement references, and the metrological quality assurance that is urgently needed in many contemporary applications.

  • 46.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Measure for Measure2010Inngår i: Public Service Review: Science and Technology, s. 9-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The global ‘Grand Challenges’ of today’s society – from climate change to economic recession – can be met by science and technology, as is well-known to most readers. Perhaps less well-known is a part of society’s technological infrastructure, not as visible as the universities or industries, but omnipresent and with a long tradition reaching as far back as the Old Testament – namely quality assured measurement or ‘metrology’. ‘You are to use accurate scales’ [Ezekiel 45:10] is just as relevant, and metrology is indeed flourishing in response to today’s challenges. Europe has realised this and is currently investing in a major new €400m metrology research programme (EMRP)1, engaging over 20 countries as one of the most integrated collaborations in the flagship European Research Area (ERA).

  • 47.
    Pendrill, Leslie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Meeting future needs for metrological traceability - A physicist's review.2005Inngår i: Journal for Quality, Reliability and Comparability in Chemical Measurement, Vol. 10, s. 133-139Artikkel i tidsskrift (Fagfellevurdert)
  • 48.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Metrological qualityassurance in person-centred healthcare and other qualitative observations2017Inngår i: Abteilung 8: Medizinphysik und metrologische Informationstechnik, Berlin, 2017Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Measurements with categorical data – produced with ‘instruments’ such as questionnaires, ability tests, – in education, healthcare and so on, need metrological quality assurance. A patient expects that the quality of care will be comparable wherever and whenever care is provided, but metrological quality assurance has yet to be developed in many cases. When seeking an increased stringency in measurement where human perception is a key factor, ensuring metrological comparability (‘traceability’) and reliably declaring measurement uncertainty when assessing patient ability, service satisfaction or material hardness are challenging. Subjective measurements are often characterised by large dispersion; the usual tools of statistics do not always work on the categorical and ordinal scales typical of such measurements; and an independent objective reality in what is being measured might be questioned. Drawing simple analogies between engineering instruments such as thermometers and social instruments such as questionnaires merely in terms of measurement error does not go far enough when attempting to introduce metrology to qualitative observations (examinations, assessments, opinions). Modelling inferences of a measurement system where the instrument is a human being, and where the output of the instrument in response to probing an object (‘entity’) is a performance metric, i.e., how well the set-up performs the assessment, does appear to be a way forward. Be it decision risks arising from measurement uncertainty or responses to a cognitive test in a clinic for Alzheimer patients, a psychometric, generalised linear model can yield quantities, ‘latent’ (or ‘explanatory’) variables, – task challenge or person ability – which seem to possess quantitative characteristics akin to those of physical quantities. Metrological references for comparability via traceability and reliable estimates of uncertainty and decision risks are then in reach even for perceptive measurements. Metrological quality assurance in person-centred healthcare is being developed for sufferers in cases such as Myotonic Dystrophy and Alzheimer’s disease, as studied in the EMPIR 15HLT04 NeuroMet project

  • 49.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Metrology and sustainability accounting standards2018Inngår i: The New Algorithm: Setting a new market standardfor financial systems, Stockholm, 2018Konferansepaper (Annet (populærvitenskap, debatt, mm))
  • 50.
    Pendrill, Leslie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Metrology of categorical data in psychometrics2017Konferansepaper (Annet vitenskapelig)
12 1 - 50 of 96
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