power.mean: Approximates the power of a one-sample t-test for a planned...

In statpsych: Statistical Methods for Psychologists

Approximates the power of a one-sample t-test for a planned sample size

Description

Computes the approximate power of a one-sample t-test for a planned sample size. For a conservatively low power approximation, set the variance planning value to the largest value within its plausible range, and set the effect size to a minimally interesting value.

Usage

power.mean(alpha, n, var, es)

Arguments

alpha	alpha level for hypothesis test
n	planned sample size
var	planning value of response variable variance
es	planning value of mean minus null hypothesis value

Value

Returns the approximate power of the test

Examples

power.mean(.05, 15, 80.5, 7)

# Should return:
#     Power
# 0.8021669

statpsych documentation built on Sept. 11, 2024, 7:42 p.m.