Exact moments and probabilities for Wei's urn randomization model

Autor:	Neal L. Oden, Matthew J. McIntosh
Rok vydání:	2006
Předmět:	Statistics and Probability Combinatorics Class (set theory) Randomization Probability theory Calculus Probability distribution Variance (accounting) Statistics Probability and Uncertainty Expression (mathematics) Mathematics
Zdroj:	Statistics & Probability Letters. 76:1694-1700
ISSN:	0167-7152
DOI:	10.1016/j.spl.2006.04.012
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::803bd43417aad4f46c3c16d232c82196 https://doi.org/10.1016/j.spl.2006.04.012 Zobrazit plný text záznamu Full Text from ScienceDirect