Task 3: Patient-Centered Information Retrieval, IRTask 1: ad-hoc search - TEAM ub-botswana

This paper describes the methods used for our participation to the CLEF (Conference and Labs of the Evaluation Forum) eHealth 2016 Task 3: Patient-Centered Information Retrieval, IRTask 1: ad-hoc search. For this participation, we evaluate the effectiveness of three different retrieval strategies. In particular, we deploy PL2 with Boolean Fallback as our baseline system. In another approach, we deploy the collection enrichment approach, where the original query is expanded with additional terms from an external collection (collection not being searched). To deliver an effective ranking, we combine the first two rankers using data fusion techniques.