Kendall’s Tau (τ) is a non-parametric measure of relationships between columns of ranked data.
The Tau correlation coefficient returns a value of 0 to 1, where:
0 is no relationship,
1 is a perfect relationship
Formula: T = 2S / (N (N -1))
Where:
S = (score of agreement - score of disagreement on X and Y)
N = Number of objects or individuals ranked on both X and Y
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Best books for Statistics in Psychology and Education: amzn.to/3E7vPlf
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