FAQ/tab80142013-03-08 10:17:13localhostconverted to 1.6 markup32010-07-22 14:07:43PeterWatson22010-07-22 14:06:49PeterWatson12010-07-22 14:01:35PeterWatsonSample sizes per group for 80% power with a one-tailed test of independent proportionsThe table below gives the sample size to get 80% power required in each group where the group proportions are as in the row and column for a one-tailed type I error of 5%. 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
0.1 158 50 27 17 12 9 7 5
0.2 232 66 32 19 13 9 7
0.3 282 75 35 20 13 9
0.4 307 78 35 19 12
0.5 307 75 32 17
0.6 282 66 27
0.7 232 50
0.8 158