Journal
BIOMETRICAL JOURNAL
Volume 47, Issue 2, Pages 177-187Publisher
WILEY
DOI: 10.1002/bimj.200410097
Keywords
difference of two proportions; exact and asymptotic confidence intervals; exact and asymptotic tests; unconditional tests; 2 x 2 tables
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In order to analyse a 2 x 2 table it is usual to perform inferences (hypothesis test or interval of confidence) on the difference d = p(2) - p(1) between two independent proportions. To this end it has been customary to adopt the Fisher conditional method, but nowadays the unconditional method of Barnard is increasingly adopted. However, all the present unconditional inferences are based on a double-binomial model. This article performs these inferences - exact and asymptotic - under a multinomial model, which is the appropriate one when the data proceed from a cross-sectional survey. At http://www.ugr.es/-bioest/SG-ASO.EXE there is a program for performing the said unconditional tests PF that may be copied.
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