Journal
STATISTICS IN MEDICINE
Volume 27, Issue 26, Pages 5497-5508Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/sim.3376
Keywords
Bayesian interval; binomial distribution; relative risk; sample size
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Several large-sample confidence intervals for the ratio of independent binomial proportions are compared in terms of exact coverage probability and width. A non-iterative approximate Bayesian interval is derived and its frequency properties are superior to all of the non-iterative confidence intervals considered. The approximate Bayesian interval, which is very easy to compute, has performance characteristics that are very similar to the computationally intensive score method. Two sample size determination formulas are presented, one for desired absolute precision and the other for desired relative precision. Copyright (C) 2008 John Wiley & Sons, Ltd.
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