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Normally approximated Bayesian credible interval of binomial proportion
Journal of the Korean Data & Information Science Society 2019;30:233-44
Published online January 31, 2019;
© 2019 Korean Data and Information Science Society.

Lionel Sahabo1 · Seongbaek Yi2

12Department of Statistics, Pukyong National University
Correspondence to: Professor, Department of Statistics, Pukyong National University, Busan 48513, Korea. E-mail:
Received October 17, 2018; Revised January 1, 2019; Accepted January 1, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The success probability in a binomial distribution has been of much interest in many fields. Most articles about its interval estimation have given focus on traditional approaches, while there were seldom on Bayesian approaches. In this article we give focus on the interval estimation based on normal approximation to posterior distribution, and compare its performance with major interval estimations in terms of coverage probability related measures. The approximate Bayesian credible interval, based on similar ideas to that of the Wald or Wilson interval, is easily derived and simple to memorize and shows comparable results to popular classical interval methods.
Keywords : Bayesian credible interval, binomial proportion, coverage probability, interval estimation.