size.test.cronbach {statpsych} | R Documentation |
Computes the sample size required to test a Cronbach reliability with desired power.
size.test.cronbach(alpha, pow, rel, r, h)
alpha |
alpha level for hypothesis test |
pow |
desired power |
rel |
reliability planning value |
r |
number of measurements |
h |
null hypothesis value of reliability |
Returns the required sample size
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.
size.test.cronbach(.05, .85, .80, 5, .7) # Should return: # Sample size # [1,] 139