1. Department of Mathematics and Statistics , University of South Carolina , Columbia, S. C, 29208;2. Department of Statistics , The Ohio State University , Columbus, Ohio, 43210
Abstract:
In this paper we propose and study two sequential elimination procedures for selecting all new treatments better than a standard or control treatment. These procedures differ from those previously proposed in that we assume variances are unequal and unknown. Expressions for asymptotic expected sample sizes are given. Confidence intervals associated with the procedures are also discussed.