Source
incanter/stats.clj:2848
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(defn normalized-kendall-tau-distance
"
http://en.wikipedia.org/wiki/Kendall_tau_distance
Kendall tau distance is the total number of discordant pairs.
"
[a b]
(let [n (count a)
discords (discordant-pairs a b)]
(/ (* 2 discords)
(* n (- n 1)))))
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