Kendall's rank correlation coefficient

Kendall's rank correlation coefficient

[¦ken·dəlz ¦raŋk ‚kä·rə′lā·shən ‚kō·ə‚fish·ənt]
(statistics)
A statistic used as a measure of correlation in nonparametric statistics when the data are in ordinal form. Also known as Kendall's tau.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Based on those measured datasets, (10) is employed for the aforementioned copulas to obtain Kendall's rank correlation coefficient [tau], and then the parameters of the copulas can be calculated using (8), (9), and the maximum likelihood method (MLE) [30], as shown in Table 3.
To examine the agreement between the two versions of the test, we used Kendall's rank correlation coefficient [tau]-B, and Spearman's rank correlation coefficient for ranked variables following the order determined by items' higher or lower frequencies.