122013-03-08 10:17:14localhostconverted to 1.6 markup112008-05-02 11:43:29PeterWatson102008-02-19 16:30:39PeterWatson92008-02-19 16:30:21PeterWatson82007-01-15 10:00:44PeterWatson72007-01-15 10:00:23PeterWatson62006-12-08 10:26:21PeterWatson52006-12-08 10:26:01PeterWatson42006-12-06 13:09:14PeterWatson32006-12-06 13:08:49PeterWatson22006-11-29 15:25:09PeterWatson12006-10-16 16:13:46PeterWatsonSee also here. Computes power for testing prop=const where prop and const are observed and expected (constant) proportions respectively, ntot is the total sample size and alpha is the (two-tailed) type I error. Power computation is also available using a spreadsheet and in R. [COPY AND PASTE THE SYNTAX BELOW INTO A SPSS SYNTAX WINDOW AND RUN; SET DATA AS DESIRED]