Concepts
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for which average precision values are calculated by averaging over all queries the individual precision values corresponding to the standard recall values
...Interpolation Many interpolation techniques have been suggested in the literature
...IMG SRC Fig
...Figure 7
...It is an experimental fact that average precision recall graphs are monotonically decreasing
...Let R [[lambda]],P [[lambda]]be the set of precision recall values obtained by varying some parameter [[lambda]]... |
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value can be calculated
...For a derivation of this relation from Bayes Theorem,the reader should consult the author s recent paper on retrieval effectiveness [10]...Averaging techniques The method of pooling or averaging of the individual P R curves seems to have depended largely on the retrieval strategy employed
...where As is the set of documents relevant to request s
...where B [[lambda]]s is the set of documents retrieved at or above the co ordination level [[lambda]]...Figure 7
...An alternative approach to averaging is macro evaluation which can be independent of any parameter such as co ordination level
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