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Mean average precision (MAP)
Average of the precision value obtained for the top k documents, each time a relevant doc is retrieved
Avoids interpolation, use of fixed recall levels
MAP for query collection is arithmetic ave.
Macro-averaging: each query counts equally
If we have a known (though perhaps incomplete) set of relevant documents of size Rel, then calculate precision of the top Rel docs returned
Perfect system could score 1.0.
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