size.ci.cronbach2: Sample size for a 2-group Cronbach reliability difference...

In statpsych: Statistical Methods for Psychologists

Sample size for a 2-group Cronbach reliability difference confidence interval

Description

Computes the sample size required to estimate a difference in population Cronbach reliability coefficients with desired precision in a 2-group design.

Usage

size.ci.cronbach2(alpha, rel1, rel2, r, w)

Arguments

alpha	alpha level for hypothesis test
rel1	group 1 reliability planning value
rel2	group 2 reliability planning value
r	number of measurements (items, raters)
w	desired confidence interval width

Value

Returns the required sample size per group

References

\insertRef

Bonett2015statpsych

Examples

size.ci.cronbach2(.05, .85, .70, 8, .15)

# Should return:
#      Sample size per group
# [1,]                   180
 

statpsych documentation built on July 9, 2023, 6:50 p.m.