Sample size to test a Cronbach reliability — size.test.cronbach • statpsych

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

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)
#>  Sample size
#>          139

# Should return:
# Sample size
#         139