SPECTRUM: Sample size calculator for squared multiple correlation

Number of predictor variables (k):
Desired 95% confidence interval width (w):
Expected value of the squared multiple correlation (adjR²):

Required sample size (n) =

References:
Bonett, D.G., & Wright, T.A. (2011). Sample size requirements for multiple regression interval estimation. Journal of Organizational Behavior, 32(6), 822-830. https://doi.org/10.1002/job.717
Bonett, D., & Wright, T. (2014). Sample size planning for multiple correlation: reply to Shieh (2013). Psicothema 26(3), 391-394. https://doi.org/10.7334/psicothema2013.309

Citation:
Priyadi, S. (2024). SPECTRUM: A web-based tool for calculating the required sample size for a squared multiple correlation. Zenodo. https://doi.org/10.5281/zenodo.12507138