Miracl at Clef 2015 : User-Centred Health Information Retrieval Task

This paper presents our second participation in user-centred health information retrieval task at the CLEFeHealth 2015. This task has as objective to retrieve pertinent documents that answer circumlocutory queries posed by users when they are faced with symptoms and signs of a disease. We have submitted five runs, the first is the baseline system and the other runs use the pseudo relevance feedback technique to expand the original query in different ways. This year, result pools are built from receiving submissions for all participants considering the top 10 documents ranked by every three highest priority runs (1, 2, 3). The obtained results are motivating, but we can be improved with P@10=0.3212 for the baseline system and p@10=0.2939 for the best P@10 in the other runs.