A note on new confidence intervals for the difference between two proportions based on an Edgeworth expansion

Zhou and Qin [2004. New intervals for the difference between two independent binomial proportions. J. Statist. Plann. Inference 123, 97-115; 2005. A new confidence interval for the difference between two binomial proportions of paired data. J. Statist. Plann. Inference 128, 527-542] new confidence intervals for the difference between two treatment proportions exhibit a severe lack of invariance property that is a compelling reason not to use them. (c) 2006 Elsevier B.V. All rights reserved.