Approximates the power of a 1-group proportion test for a planned sample size

Source: R/statpsych3.R

Computes the approximate power of a one-sample proportion test for a planned sample size. Set the proportion planning value to .5 for a conservatively low power estimate. The value of the effect size need not be based on the proportion planning value.

power.prop(alpha, n, p, es)

Arguments

alpha

alpha level for hypothesis test

n

planned sample size

p

planning value of proportion

es

planning value of proportion minus null hypothesis value

Value

Returns the approximate power of the test

Examples

power.prop(.05, 40, .5, .2)
#>      Power
#>  0.7156166

# Should return:
#     Power
# 0.7156044