FRIDAY, January 31, 2003
Time: 1:30 - 2:30 PM
Constant Hall Room 1052

Jimmy A. Doi
Department of Statistics, North Carolina State University

Exact tests based upon the difference of two independent binomial proportions are popularly used and are especially suited for studies with small to moderate sample sizes. In the context of testing for superiority, we apply the confidence region p-value method (Berger and Boos, 1994) in proposing an exact test which has been found to perform better than the standard exact test in many situations. In both cases, the tests use unconditional distributions and the variances of the test statistics are determined via a restricted maximum likelihood method (Farrington and Manning, 1990). Inverting the tests, we derive corresponding confidence intervals and we provide coverage probability and expected length comparisons.