Accreditation and Quality Assurance

, Volume 9, Issue 8, pp 441–444

Comments on “Cofino statistics”

Review Paper


Cofino et al. have put forward a method for the analysis of data from interlaboratory studies. The method uses ideas and notation from quantum chemistry, and is quite sophisticated. A critical examination shows that it has some relationship with both kernel density estimation and robust estimation methods. The quantitative results it provides are not founded on any statistical probability model, and it is not at all clear how the variance in particular is to be interpreted. There is no clear argument for adopting Cofino statistics in preference to simple problem-free methods that are at least as effective in estimating a concensus value.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Analytical Methods Committee, Analytical DivisionThe Royal Society of ChemistryLondonUK
  2. 2.Department of Statistical ScienceUniversity College LondonLondonUK

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