size.test.cor2 {statpsych} | R Documentation |
Sample size for a test of equal Pearson or partial correlation in a 2-group design
Description
Computes the sample size required to test equality of two Pearson or partial correlation with desired power in a 2-group design. Set s = 0 for a Pearson correlation. Set R = 1 for equal sample sizes.
Usage
size.test.cor2(alpha, pow, cor1, cor2, s, R)
Arguments
alpha |
alpha level for hypothesis test |
pow |
desired power |
cor1 |
correlation planning value for group 1 |
cor2 |
correlation planning value for group 2 |
s |
number of control variables |
R |
n2/n1 ratio |
Value
Returns the required sample size for each group
Examples
size.test.cor2(.05, .8, .4, .2, 0, 1)
# Should return:
# n1 n2
# 325 325
size.test.cor2(.05, .8, .4, .2, 0, 2)
# Should return:
# n1 n2
# 245 490
[Package statpsych version 1.8.0 Index]