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I want to use Kendall's Tau to check rank correlation in some data. I have two sets of data, and hence compute two values, $\tau_a$ and $\tau_b$. How do I test if $\tau_a$ is significantly different from $\tau_b$?

For perspective, If I were using Pearson/Spearman correlations, I would do a Fisher transformation followed by a Z-test to obtain a p-value. I something similar possible for Kendall's tau?

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