Grubbs-Type Estimators for Reproducibility Variances in an Interlaboratory Test Study

Abstract

The well-known model of Grubbs, which is based on repeatability conditions, is generalized to reproducibility conditions in an interlaboratory test study. ANOVA estimators are developed for the repeatability and reproducibility variances of each procedure as well as for the variability within and between laboratories. The paper gives a solution to a problem which often occurs in practice, but which cannot be tackled by the standard model of ISO 5725.