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From Sean Owen <>
Subject Re: Recommendations on binary ratings
Date Fri, 11 Jun 2010 13:44:56 GMT
I would map all ratings, of all values, to a 1. Practically speaking
this is probably more 'accurate'.

Are you using a precision-recall test? they're not terribly
informative, though they're about the only thing you can do to
evaluate recommendations without ratings. That is, it's testing
whether it recommends back already-known items, but, that's not
necessarily a good test of whether it's making good recommendations.
It could be recommending better stuff and not getting credit.

So, i wouldn't necessarily worry.

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