size.ci.phi: Sample size for phi correlation confidence interval

In statpsych: Statistical Methods for Psychologists

Sample size for phi correlation confidence interval

Description

Computes the sample size required to estimate a phi correlation with desired confidence interval precision. Set the phi correlation planning value to the smallest absolute value within a plausible range for a conservatively large sample size.

Usage

size.ci.phi(alpha, p1, p2, phi, w)

Arguments

alpha	alpha level for 1 - alpha confidence
p1	planning value for row 1 marginal proportion
p2	planning value for column 1 marginal proportion
phi	planning value for phi correlation
w	desired confidence interval width

Value

Returns the required sample size

Examples

size.ci.phi(.05, .7, .8, .35, .2)

# Should return:
#  Sample size
#          416

statpsych documentation built on April 4, 2025, 3:20 a.m.