How do I determine k when using k-means clustering?

Posted by Jason Baker on Stack Overflow See other posts from Stack Overflow or by Jason Baker
Published on 2009-11-24T22:58:08Z Indexed on 2010/06/15 11:22 UTC
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I've been studying about k-means clustering, and one thing that's not clear is how you choose the value of k. Is it just a matter of trial and error, or is there more to it?

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