Statnote 15: the non-parametric correlation coefficients

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Abstract

If in a correlation test, one or both variables are small whole numbers, scores based on a limited scale, or percentages, a non-parametric correlation coefficient should be considered as an alternative to Pearson’s ‘r’. Kendall’s t and Spearman’s rs are similar tests but the former should be considered if the analysis is to be extended to include partial correlations. If the data contain many tied values, then gamma should be considered as a suitable test.

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Original languageEnglish
Pages41-43
Number of pages3
Volume2008
JournalMicrobiologist
Publication statusPublished - Dec 2008

    Keywords

  • correlation test, non-parametric correlation coefficient

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