size.ci.cor2: Sample size for a 2-group Pearson correlation difference...

In statpsych: Statistical Methods for Psychologists

Sample size for a 2-group Pearson correlation difference confidence interval

Description

Computes the sample size required to estimate a difference in population Pearson or partial correlations with desired confidence interval precision in a 2-group design. Set the correlation planning values to the smallest absolute values within their plausible ranges for a conservatively large sample size.

Usage

size.ci.cor2(alpha, cor1, cor2, w)

Arguments

alpha	alpha level for 1-alpha confidence
cor1	correlation planning value for group 1
cor2	correlation planning value for group 2
w	desired confidence interval width

Value

Returns the required sample size

References

\insertRef

Bonett2000statpsych

Examples

size.ci.cor2(.05, .8, .5, .2)

# Should return:
# Sample size per group
#                   271
 

statpsych documentation built on June 10, 2025, 5:11 p.m.