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Large-scale information retrieval evaluation efforts such as TREC and NTCIR have tended to adhere to binary-relevance evaluation metrics, even when graded relevance data were available. However, the NTCIR-6 Crosslingual Task has finally started adopting graded-relevance metrics, though only as additional metrics. This paper compares three existing graded-relevance metrics that were mentioned in the Call for Participation of the NTCIR-6 Crosslingual Task in terms of the ability to control howdblp:conf/ntcir/Sakai07 fatcat:sjkrsviwirf5dfp3vr3b4eeuuy