Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1155309 | Statistics & Probability Letters | 2006 | 7 Pages |
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
Authors
Neal L. Oden, Matthew J. McIntosh,