Comparison of OpenEpi module ‘Sample Size For Comparing Two Means’ to other public software and
statistical textbook.
Date last tested: 7/11/05.
|
CI %, power %, ratio of n2 /n1, Mean difference (Group 1 – Group 2), s1, s2. |
|||
Data input |
95%, 80%, 1, 5.42, 15.34, 18.23 |
95%, 80%, 2, 5.42, 15.34, 18.23 |
95%, 80%, 1, -0.24, 0.64, 0.76 |
95%, 90%, 2, 1, 3.0, 2.8 |
OpenEpi |
n1 = 152 n2 = 152 |
n1 = 108 n2 = 216 |
n1 = 135 n2 = 135 |
n1 = 133 n2 = 133 |
Rosner |
n1 = 152 n2 = 152 |
n1 = 108 n2 = 216 |
n1 = 135 n2 = 135 |
n1 = 133 n2 = 133 |
‘CI’ Confidence
interval; ‘n1’ sample size of
Group 1; ‘n2’ sample size of Group
2; ‘s1’ standard deviation of
Group 1 ‘s2’ standard deviation of Group 2;
Reference:
·
Bernard Rosner. Fundamentals of Biostatistics (5th edition). (data
obtained from examples and problems)