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Tau, K-S Test and W^2 (K-S Test (K-S test prove discordant between two…
Tau, K-S Test and W^2
K-S Test
K-S test prove discordant between two ranking even with a SINGLE swap of item. It is this test's WEAKNESS
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Let X_1, X_2, ..., X_n is the standard ranking order
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Kendall's Tau
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when n large, follow Normal(0, 2/9 * (n+2.5)/C(n,2))
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fail to take into accounts the importance of top relevant documents when n is large ---> Kolmogorov-Smirnov is a better choice in this case
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