, Volume 65, Issue 1, pp 23–28

Sample size requirements for estimating pearson, kendall and spearman correlations


  • Douglas G. Bonett
    • Department of StatisticsIowa State University
  • Thomas A. Wright
    • University of Nevada

DOI: 10.1007/BF02294183

Cite this article as:
Bonett, D.G. & Wright, T.A. Psychometrika (2000) 65: 23. doi:10.1007/BF02294183


Interval estimates of the Pearson, Kendall tau-a and Spearman correlations are reviewed and an improved standard error for the Spearman correlation is proposed. The sample size required to yield a confidence interval having the desired width is examined. A two-stage approximation to the sample size requirement is shown to give accurate results.

Key words

sample sizeinterval estimationcorrelationrank correlation
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© The Psychometric Society 2000