size.test.cor2: Sample size for a test of equal Pearson or partial...

In statpsych: Statistical Methods for Psychologists

Sample size for a test of equal Pearson or partial correlation in a 2-group design

Description

Computes the sample size required to test the equality of two population Pearson or partial correlations with desired power in a 2-group design. Set s = 0 for a Pearson correlation.

Usage

size.test.cor2(alpha, pow, cor1, cor2, s)

Arguments

alpha	alpha level for hypothesis test
pow	desired power
cor1	planning value of correlation for group 1
cor2	planning value of correlation for group 2
s	number of control variables

Value

Returns the required sample size for each group

Examples

size.test.cor2(.05, .8, .4, .2, 0)

# Should return:
# Sample size per group
#                   325
 

statpsych documentation built on Sept. 11, 2024, 7:42 p.m.