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The Tau index is a clustering validation metric reviewed by Rohlf in 1974 ... •It's similar to established rank correlation coefficients (like Kendall's τ).

https://www.graphpad.com/guides/prism/latest/statistics/

Prism can perform correlation analyses from XY, Column, and Multiple Variables data tables. Click the Analyze button and choose correlation.

https://www.graphpad.com/guides/prism/latest/statistics/

Correlation coefficient The correlation coefficient, r, ranges from -1 to +1. The nonparametric Spearman correlation coefficient, abbreviated rs, ...

https://www.graphpad.com/guides/prism/latest/statistics/