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Statistics In Medicine

Method to estimate sample size for the van Elteren test is presented

Published in Medical Letter on the CDC and FDA, September 24th, 2006

A scientist presents a method to estimate sample size for the van Elteren test - a stratified Wilcoxon-Mann-Whitney test - in a recent issue of Statistics in Medicine.

"The van Elteren test is a type of stratified Wilcoxon-Mann-Whitney test for comparing two treatments accounting for strata. In this paper, we study sample size estimation methods for the asymptotic version of the van Elteren test, assuming that the stratum fractions (ratios of each stratum size to the total sample size) and the treatment fractions (ratios of each treatment size to the stratum size) are known in the study design," wrote Yan D. Zhao at Eli Lilly and Company.

"In...

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