Sample size for a paired-sample proportion difference confidence interval

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)
#>  Sample size
#>          118

# Should return:
# Sample size
#         118