Sample sizes per group for 80% power with a one-tailed test of independent proportions
The 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 |
|||||||||