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Measuring the information retrieval effectiveness of Web search engines can be expensive if human relevance judgments are required to evaluate search results. Using implicit user feedback for search engine evaluation provides a cost and time effective manner of addressing this problem. Web search engines can use human evaluation of search results without the expense of human evaluators. An additional advantage of this approach is the availability of real time data regarding system performance.doi:10.1145/1076034.1076172 dblp:conf/sigir/SharmaJ05 fatcat:xnp3irh7vra5pfbysmgxvpkotu