size.ci.prop.ps {statpsych} | R Documentation |
Sample size for a paired-sample proportion difference confidence interval
Description
Computes the sample size required to estimate a population 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 measurement 1 |
p2 |
planning value of proportion for measurement 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
# 118
[Package statpsych version 1.6.0 Index]