]> 2008-04-25T09:00:00-05:00 I also present a heuristic to automatically estimate a user's valuation of document relevance relative to document diversity. Many existing methods for diversifying search result sets include parameters that control the role that relevance and diversity play in selecting search results. However, these methods do not automatically customize the values of these controlling parameters to individual users. I present an approach to estimate each user's personal valuation of relevance and diversity in search results automatically, with no need for manual supervision. ]]>