ChiES: Compute power for Chi Square Based on Effect Size
Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user
Description
Compute power for Chi Square Based on Effect Size
Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user
Usage
ChiES(phi, df, nlow, nhigh, by = 1, alpha = 0.05)
Arguments
phi
phi coefficient (effect size for 2x2)
df
degrees of freedom
nlow
starting sample size
nhigh
ending sample size
by
Incremental increase in sample (e.g. nlow = 10, nhigh = 24, by = 2, produces estimates of 10, 12, and 14)