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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
... |
