Article ID Journal Published Year Pages File Type
1155309 Statistics & Probability Letters 2006 7 Pages PDF
Abstract

We provide closed-form expressions for the probabilities in Wei's [1997. A class of designs for requential clinical trials. J. Amer. Statist. Assoc. 72, 382–386] urn randomization model, and develop a non recursive, exact variance expression, with extensions for K colors, and M:N randomization. Accuracy of the exact variance expression exceeds that of a previously published asymptotic expression.

Related Topics
Physical Sciences and Engineering Mathematics Statistics and Probability
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