size.ci.prop.ps: Sample size for a paired-sample proportion difference...

In statpsych: Statistical Methods for Psychologists

Sample size for a paired-sample proportion difference confidence interval

Description

Computes the sample size required to estimate a proportion difference with desired confidence interval precision in a paired-samples design. Set the proportion planning values to .5 for a conservatively large sample size. Set the phi correlation planning value to the smallest value within a plausible range for a conservatively large sample size.

Usage

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

Arguments

alpha	alpha level for 1-alpha confidence
p1	planning value of proportion for group 1
p2	planning value of proportion for group 2
phi	planning value of phi correlation
w	desired confidence interval width

Value

Returns the required sample size

Examples

size.ci.prop.ps(.05, .2, .3, .8, .1)

# Should return:
#      Sample size
# [1,]         118

statpsych documentation built on July 9, 2023, 6:50 p.m.