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Table 5 MAP@10 and MAP@20 for 2nd-round and 3rd--round search when k takes different values

From: Integrating unified medical language system and association mining techniques into relevance feedback for biomedical literature search

  k = 10 k = 20 k = 30 k = 40 k = 50
MAP@10 2nd 0.807 0.827 0.842 0.813 0.806
3rd 0.816 0.840 0.866 0.824 0.812
MAP@20 2nd 0.703 0.708 0.728 0.715 0.703
3rd 0.717 0.719 0.731 0.721 0.716