Computes the sample size required to estimate a single proportion with desired confidence interval precision. Set the proportion planning value to .5 for a conservatively large sample size.

size.ci.prop1(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.prop1(.05, .4, .2)
#>      Sample size
#> [1,]          93

# Should return:
#      Sample size
# [1,]          93