size.test.slope.gen: Sample size for a slope hypothesis test in a general...

In statpsych: Statistical Methods for Psychologists

Sample size for a slope hypothesis test in a general statistical model

Description

Computes the sample size required to test a null hypothesis with desired power that a population slope coefficient in any general statistical model is equal to zero. This function requires a standard error estimate for the slope of interest from a prior or pilot study and the sample size that was used in the prior or pilot study. This function can be used for both unstandardized and standardized slopes. This function also can be used for both unstandardized and standardized factor loadings in a confirmatory factor analysis model. This function will soon be replaced with size.test.gen.

Usage

size.test.slope.gen(alpha, pow, se, n0, b)

Arguments

alpha	alpha level for 1-alpha confidence
pow	desired power
se	standard error of slope from prior/pilot study
n0	sample size used in prior/pilot study
b	planning value of population slope

Value

Returns the required sample size

Examples

size.test.slope.gen(.05, .8, 3.15, 50, 5)

# Should return:
#  Sample size
#          156
 

statpsych documentation built on June 10, 2025, 5:11 p.m.