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.prop1(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 hypothesized value

Value

Returns the approximate power of the test

Examples

power.prop1(.05, 40, .5, .2)
#>         Power
#> [1,] 0.715613

# Should return:
#         Power
# [1,] 0.715613