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 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.

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 April 4, 2025, 3:20 a.m.