Exact moments and probabilities for Wei's urn randomization model

Neal L. Oden and Matthew J. McIntosh

Statistics & Probability Letters, 2006, vol. 76, issue 15, 1694-1700

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.

Keywords: Randomization; Urn; model; Eulerian; numbers (search for similar items in EconPapers)
Date: 2006
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