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Sample Size Calculator (web)

Intraclass Correlation Coefficient (ICC) - Hypothesis Testing¹

Minimum acceptable reliability (ICC) (ρ₀):
Expected reliability (ICC) (ρ₁):
Significance level (α): Two-tailed
Power (1 - β): %
Number of raters/repetitions per subject (k):
Expected dropout rate: %

Sample size, n =
Sample size (with 10% dropout), n_drop =

Intraclass Correlation Coefficient (ICC) - Estimation²

Expected reliability (ICC) (ρ):
Precision (± expected):
Confidence level 100(1 - α): %
Number of raters/repetitions per subject (k):
Expected dropout rate: %

Sample size, n =
Sample size (with 10% dropout), n_drop =

References:

¹Walter, S.D., Eliasziw, M., & Donner, A. (1998). Sample size and optimal designs for reliability studies. Statistics in medicine, 17, 101-110. [In this paper, note that n = number of replicates, k = number of subjects i.e. sample size. Here in this calculator, we use k = number of replicates, n = number of subjects.]

²Bonett, D. G. (2002). Sample size requirements for estimating intraclass correlations with desired precision. Statistics in medicine, 21(9), 1331-1335.

Suggested reference:

APA: Arifin, W. N. (). Sample size calculator (web). Retrieved from http://wnarifin.github.io

Vancouver: Arifin WN. Sample size calculator (web) [Internet]. [cited ]. Available from: http://wnarifin.github.io

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