A Comparison of the Pearson, Spearman Rank and Kendall Tau Correlation Coefficients Using Quantitative Variables
Essam F. El-Hashash, Raga Hassan Ali Shiekh
Asian Journal of Probability and Statistics · pp. 36–48 · Published 18 Oct 2022
10.9734/ajpas/2022/v20i3425Abstract
In all fields and branches of sciences especially statistics, the correlation coefficient is one of the most often used statistical measures. This study has been carried out for comparing the performances of the Pearson (), Spearman's Rank (), and Kendall’s Tau () correlation coefficients under three sample sizes based on the data of quantitative variables of cotton. Descriptive statistics showed the presence of genetic variability for the cotton studied traits in this study. The quantity, significance, and direction of the correlation calculated by differed in some cases from the other methods under the three sample sizes, opposite is true for and . The highest number of positive correlations among studied traits were by under N = 30 observations, and by and under N = 20 observations. The studied correlation methods performances by Root Mean Square Error (RMSE) revealed that and appear to be a good estimator of correlation because they have the lowest values of RMSE. The highest values of RMSE were observed by and under N=10 and N=20, and by under N=30. The results of PCA could be useful and appropriate in this study, in which the PCA1 had highly positively correlated with the three studied methods for N=10 observations, and with and for N=20 observations.
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