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From Mario Levitin <>
Subject Understanding LogLikelihood Similarity
Date Sun, 27 Apr 2014 22:30:41 GMT

I've used LogLikelihood Similarity in user based nearest neighborhood
collaborative filtering and it has given good results (better than the

I have read the blog post by Ted Dunning ( also
looked at the implementation in Mahout. However, I still do not understand
"why" this similarity metric works.

I'm trying to give it a probabilistic interpretation in order to understand
the logic behind. Any probabilistic interpretation should define random
variables, events, etc. However, my attempts in this respect have been

Any help will be appreciated.

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