Article1973

The rapid estimation and control of precision by duplicate determinations

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Scientific Measurement and Uncertainty Evaluation Clinical Laboratory Practices and Quality Control Spectroscopy and Chemometric Analyses

Abstract

Studies on computer-simulated models have provided several new methods of estimating, studying or controlling analytical precision in real systems. The methods are based upon precision estimators derived from the difference between duplicate analyses, and take into account variations in the precision of a determination with the concentration of the substance being determined. The methods have been checked by applying them to simulated samples of many duplicate analyses drawn by Monte Carlo techniques from specified populations, that is, in effect, from analytical systems with known precision characteristics. Some examples show the application of the methods in practice.

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2007Average Relative Error in Geochemical Determinations: Clarification, Calculation, and a Plea for Consistency 2008Quality Control of Assay Data: A Review of Procedures for Measuring and Monitoring Precision and Accuracy 2006On the special application of Thompson–Howarth error analysis to geochemical variables exhibiting a nugget effect 2001Modelling measurement uncertainty as a function of concentration: an example from a contaminated land investigation 2003THPLOT.M: A MATLAB function to implement generalized Thompson–Howarth error analysis using replicate data 1986Monitoring the precision of routine analyses by using duplicate determinations 1978Dupan 3, a subroutine for the interpretation of duplicated data in geochemical analysis 2008Thompson–Howarth error analysis: unbiased alternatives to the large-sample method for assessing non-normally distributed measurement error in geochemical samples

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