size.test.mean: Sample size for a test of a mean

In statpsych: Statistical Methods for Psychologists

Sample size for a test of a mean

Description

Computes the sample size required to test a single population mean with desired power in a 1-group design. Set the variance planning value to the largest value within a plausible range for a conservatively large sample size.

Usage

size.test.mean(alpha, pow, var, es)

Arguments

alpha	alpha level for hypothesis test
pow	desired power
var	planning value of response variable variance
es	planning value of mean minus null hypothesis value

Value

Returns the required sample size

Examples

size.test.mean(.05, .9, 80.5, 7)

# Should return:
# Sample size
#          20
 

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