JGWeissman comments on Bayesian Collaborative Filtering - Less Wrong
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I'm the founder of TakeOnIt, so let me add a little here.
JGWeissman's algorithm, or an evolution of it based on the feedback here, will be replacing the crude algorithm that's already online. You can see the results of that algorithm here:
Predicting Eliezer Yudkowsky's Opinions
If anyone else needs access to the database let me know.
Part of the vision here is to help people choose their beliefs in areas where they don't have domain expertise. This concept was described here.
In addition, this technique can also be used to detect correct contrarian opinions, as described here. The algorithm will predict that person S should believe in a minority opinion I if S has similar opinions to the set of people T, where T hold the opinion I.
Fun Fact: My algorithm's most confident prediction about Ben is that with 67% probability, he Disagrees on the issue Is the unconscious philosophical zombie possible?.
(Ben has registered his position on 7 issues.)