corr.2samp: Power calculation for comparing two correlation coefficients

In powertools: Power and Sample Size Tools

Power calculation for comparing two correlation coefficients

Description

Calculates power and sample size for a test that the correlation coefficients in two groups/populations are equal. Can solve for power, n1, n.ratio or alpha.

Usage

corr.2samp(
  n1 = NULL,
  n.ratio = 1,
  rho1 = NULL,
  rho2 = NULL,
  alpha = 0.05,
  power = NULL,
  sides = 2,
  v = FALSE
)

Arguments

n1	The sample size for group 1.
n.ratio	The ratio n2/n1 between the sample sizes of two groups; defaults to 1 (equal group sizes).
rho1	The correlation coefficient in group 1.
rho2	The correlation coefficient in group 2.
alpha	The significance level (type 1 error rate); defaults to 0.05.
power	The specified level of power.
sides	Either 1 or 2 (default) to specify a one- or two- sided hypothesis test.
v	Either TRUE for verbose output or FALSE (default) to output computed argument only.

Value

A list of the arguments (including the computed one).

Examples

corr.2samp(n1 = 300, rho1 = 0.3, rho2 = 0.1, sides = 1)

powertools documentation built on April 4, 2025, 5:02 a.m.