Expanded Uncertainty of a Measurement and an Uncertainty Budget for a Single Measurement

Ratcliffe, Colin P.; Ratcliffe, Bridget

doi:10.1007/978-3-319-12063-8_4

Cited by 3 publications

(3 citation statements)

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“…For larger volumes, the absolute bias becomes somewhat larger and reaches up to −27 nl. Given the measurement uncertainty of the gravimetric method and the Artel method [24] as shown in figure 4, all measured values have to be considered to be consistent, since the bias is always smaller than the corresponding measurement uncertainty.…”

Section: Resultsmentioning

confidence: 99%

Novel gravimetric measurement technique for quantitative volume calibration in the sub-microliter range

Dong¹,

Steinert

Bammesberger

et al. 2012

Meas. Sci. Technol.

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We present a novel measurement method based on the gravimetric principles adapted from the ASTM E542 and ISO 4787 standards for quantitative volume determination in the sub-microliter range. Such a method is particularly important for the calibration of non-contact micro dispensers as well as other microfluidic devices. The novel method is based on the linear regression analysis of continuously monitored gravimetric results and therefore is referred to as ‘gravimetric regression method (GRM)’. In this context, the regression analysis is necessary to compensate the mass loss due to evaporation that is significant for very small dispensing volumes. A full assessment of the measurement uncertainty of GRM is presented and results in a standard measurement uncertainty around 6 nl for dosage volumes in the range from 40 nl to 1 µl. The GRM has been experimentally benchmarked with a dual-dye ratiometric photometric method (Artel Inc., Westbrook, ME, USA), which can provide traceability of measurement to the International System of Units (SI) through reference standards maintained by NIST. Good precision (max. CV = 2.8%) and consistency (bias around 7 nl in the volume range from 40 to 400 nl) have been observed comparing the two methods. Based on the ASTM and ISO standards on the one hand and the benchmark with the photometric method on the other hand, two different approaches for establishing traceability for the GRM are discussed.

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Section: Resultsmentioning

confidence: 99%

Novel gravimetric measurement technique for quantitative volume calibration in the sub-microliter range

Dong¹,

Steinert

Bammesberger

et al. 2012

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Instead of assuming that the goal of measurement is the closest possible estimation of an unknown true value (the Error Approach), metrology now holds that measurement information supports only an assignment of a range of values, given that no mistakes have been made. This range varies depending on what information is taken into account, leading to the development of uncertainty budgets (Bucher, 2012;Ratcliffe et al, 2015).…”

Section: Uncertainty In Metrology and Psychometricsmentioning

confidence: 99%

“…Theory-informed empirical research on reading ability has begun to approximate the level of detail obtained in the construction of instruments in the natural sciences (Andrich, in press;Fisher & Stenner, 2016;Mari & Wilson, 2014;Pendrill & Fisher, 2015;Pendrill, 2014a;Stenner et al, 2013;Wright, 1997). Implications for uncertainty budgets and the practical interpretation of psychometric measures begin from a distinction between Type A and Type B uncertainties (Committee and for Guides in Metrology (JCGM, WG 1) Evaluation of measurement data-Guide to the expression of uncertainty in measurement 2008; Ratcliffe et al, 2015).…”

Section: Uncertainty Budgetsmentioning

confidence: 99%

Towards an Alignment of Engineering and Psychometric Approaches to Uncertainty in Measurement: Consequences for the Future

Fisher

Stenner

2022

Explanatory Models, Unit Standards, and Personalized Learning in Educational Measurement

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The International Vocabulary of Measurement (VIM) and the Guide to Uncertainty in Measurement (GUM) shift the terms and concepts of measurement information quality away from an Error Approach toward a model-based Uncertainty Approach. An analogous shift has taken place in psychometrics with the decreasing use of True Score Theory and increasing attention to probabilistic models for unidimensional measurement. These corresponding shifts emerge from shared roots in cognitive processes common across the sciences and they point toward new opportunities for an art and science of living complex adaptive systems. The psychology of model-based reasoning sets the stage for not just a new consensus on measurement and uncertainty, and not just for a new valuation of the scientific status of psychology and the social sciences, but for an appreciation of how to harness the energy of self-organizing processes in ways that harmonize human relationships.

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Towards an alignment of engineering and psychometric approaches to uncertainty in measurement: Consequences for the future

Fisher

Stenner

2017

18th International Congress of Metrology

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Abstract. The International Vocabulary of Measurement (VIM) and the Guide to Uncertainty in Measurement (GUM) shift the terms and concepts of measurement information quality away from an Error Approach toward a model-based Uncertainty Approach. An analogous shift has taken place in psychometrics with the decreasing use of True Score Theory and increasing attention to probabilistic models for unidimensional measurement. These corresponding shifts emerge from shared roots in cognitive processes common across the sciences and they point toward new opportunities for an art and science of living complex adaptive systems. The psychology of model-based reasoning sets the stage for not just a new consensus on measurement and uncertainty, and not just for a new valuation of the scientific status of psychology and the social sciences, but for an appreciation of how to harness the energy of self-organizing processes in ways that harmonize human relationships.

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Expanded Uncertainty of a Measurement and an Uncertainty Budget for a Single Measurement

Cited by 3 publications

References 0 publications

Novel gravimetric measurement technique for quantitative volume calibration in the sub-microliter range

Novel gravimetric measurement technique for quantitative volume calibration in the sub-microliter range

Towards an Alignment of Engineering and Psychometric Approaches to Uncertainty in Measurement: Consequences for the Future

Towards an alignment of engineering and psychometric approaches to uncertainty in measurement: Consequences for the future

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