Die Umsetzung der Richtlinie zur Bestimmung der Anzahl von anorganischen faserförmigen Partikeln auf staubbelegten Filtern wurde in einem Ringversuch von VDI und DIN überprüft. Die Auswertung der Filter wurde zunächst in zwei Referenzlabors und danach in den teilnehmenden Prüflabors...

In many applications we obtain test statistics by combining estimates from different experiments or studies. The usual combined estimator of the overall effect in independent studies leads to systematic overestimates of the significance level, see Li et al. (1994). This results in a great number...

In this paper we derive asymptotic x2-tests for general linear hypotheses on variance components using repeated variance components models. In two examples, the two-way nested classification model and the two-way crossed classification model with interaction, we explicitly investigate the...

Positive estimators of the between-group (between-study) variance are proposed. Explicit variance formulae for the estimators are given and approximate confidence intervals for the between-group variance are constructed, as our proposal to a long outstanding problem. By Monte Carlo simulation,...