Egothor Web The two most widely used retrieval effectiveness (quality) measures are precision (P) and recall (R) as defined below:
P = #relevant-documents-returned / #documents-returned R = #relevant-documents-returned / #relevant-documents-in-collectionThe F-measure (F) is then the harmonic mean of precision and recall and it is defined as:
F = (2PR)/(P+R)It should be noted that improving recall together with precision is often an antagonistic goal.
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