Abstract

The effects of adding information from relevant documents are examined in the TREC routing environment. A modified Rocchio relevance feedback approach is used, with a varying number of relevant documents retrieved by an initial SMART search, and a varying number of terms from those relevant documents used to expand the initial query. Recall-precision evaluation reveals that as the amount of expansion of the query due to adding terms from relevant documents increases, so does the effectiveness. It is observed for this particular experiment that there seems to be a linear relationship between the log of the number of terms added and the recall-precision effectiveness. There also seems to be a linear relationship between the log of the number of known relevant documents and the recall-precision effectiveness. 1 Introduction Relevance feedback is a commonly accepted method of improving interactive retrieval effectiveness.[1, 2] An initial search is made by the system with a user-supplied ...

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