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Sample Size Calculator (web)

Pearson's Correlation - Hypothesis Testing¹

Expected correlation (r):
Significance level (α): Two-tailed
Power (1 - β): %
Expected dropout rate: %

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

Pearson's Correlation - Estimation²

Expected correlation (r):
Precision (± expected):
Confidence level 100(1 - α): %
Expected dropout rate: %

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

References:

¹Machin, D., Campbell, M. J., Tan, S. B, & Tan, S. H. (2009). Sample size tables for clinical studies (3rd eds.). West Sussex, UK: John Wiley & Sons Ltd.

²Moinester, M., & Gottfried, R. (2014). Sample size estimation for correlations with pre-specified confidence interval. The Quantitative Methods for Psychology, 10(2), 124-130. [Equation 8]

Suggested reference:

APA: Arifin, W. N. (2018). A web-based sample size calculator for reliability studies. Education in Medicine Journal, 10(3), 67–76. https://doi.org/10.21315/eimj2018.10.3.8

Vancouver: Arifin, WN. A web-based sample size calculator for reliability studies. Education in Medicine Journal. 2018;10(3):67–76. https://doi.org/10.21315/eimj2018.10.3.8

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