Computes the sample size required to estimate a population proportion
with desired confidence interval precision. Set the proportion planning
value to .5 for a conservatively large sample size.
Usage
size.ci.prop(alpha, p, w)
Arguments
- alpha
alpha level for 1-alpha confidence
- p
planning value of proportion
- w
desired confidence interval width
Value
Returns the required sample size
Examples
size.ci.prop(.05, .4, .2)
#> Sample size
#> 93
# Should return:
# Sample size
# 93