A Hornikova et al 2006 Metrologia 43 205 doi:10.1088/0026-1394/43/3/003
A Hornikova1, N F Zhang1, M J Welch2 and S Tai2
Show affiliationsNIST standard reference materials (SRMs) are certified reference materials that are developed at NIST and provided to laboratories (industry, government and academia) for assessment and improvement of measurement quality. This paper details the statistical analysis related to the recertification of SRM 1508a, benzoylecgonine (cocaine metabolite) in freeze-dried urine, to incorporate new data. The recertification is based on combining measurement results from different measurement methods and time periods. Several different statistical models and corresponding estimators were considered for the certified value, its standard uncertainty and its expanded uncertainty.
06.20.Dk Measurement and error theory
02.50.-r Probability theory, stochastic processes, and statistics
Issue 3 (June 2006)
Received 21 July 2005
Published 28 February 2006
A Hornikova et al 2006 Metrologia 43 205
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