Passage Retrieval vs. Document Retrieval in the Monolingual Task with the IR-n system

The paper describes our participation in monolingual tasks at CLEF 2006. We have submitted results for the following languages: English, French, Portuguese and Hungar-ian. We focused on studying different weighting schemes (okapi and dfr) and retrieval strategies (passage retrieval and document retrieval) to improve retrieval performance. After an analysis of our experiments and of the official results at CLEF, we find that our different configurations (French, Portuguese and Hungarian) achieve considerably improved scores