size.test.cronbach {statpsych}

Sample size to test a Cronbach reliability

Description

Computes the sample size required to test a Cronbach reliability with desired power.

Usage

size.test.cronbach(alpha, pow, rel, r, h)

Arguments

alpha

alpha level for hypothesis test

pow

desired power

rel

reliability planning value

r

number of measurements

h

null hypothesis value of reliability

Value

Returns the required sample size

References

Bonett DG, Wright TA (2015). “Cronbach's alpha reliability: Interval estimation, hypothesis testing, and sample size planning.” Journal of Organizational Behavior, 36(1), 3–15. ISSN 08943796, doi:10.1002/job.1960.

Examples

size.test.cronbach(.05, .85, .80, 5, .7)

# Should return:
# Sample size
#         139