math - rank correlation algorithm -

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My friends have a ranking list again, I get some more lists of those friends, but different rankings do list the original rankings Is there an algorithm to check the closest list?

Thanks

For example, if we define < / P>

dist (R1, R2) => The amount above all of

(in position I-R in R1 In the case of R2), you can put the status of each i in the ranking first

pos [Peter] = 3 < P> This means Peter shows as the third friend in your ranking

pos .

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