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When there is rank ordered data, ties can occur.
When this is the case, you will use a Kendall’s Tau test.
Also, when the data is scaled (equal interval) and the distribution
is skewed (to the left or right), if there are ties in the data, then
the Kendall’s Tau test should be used.
If there are no ties, use the Spearman Rho’s Ranking Test
Kendall’s Tau
Kendall’s Tau
Spearman’s Rho

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Quick reminder ties or no ties

  • 1. When there is rank ordered data, ties can occur. When this is the case, you will use a Kendall’s Tau test. Also, when the data is scaled (equal interval) and the distribution is skewed (to the left or right), if there are ties in the data, then the Kendall’s Tau test should be used. If there are no ties, use the Spearman Rho’s Ranking Test Kendall’s Tau Kendall’s Tau Spearman’s Rho