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| 153 |
if [[theta]]corresponds to a value of [[lambda]]at which an increase in recall is produced
...G s R [[theta]]s,P [[theta]]s the set of observed points for a request
...Ps R sup P:R >R s
...where R is a standard recall value
...The set of observed points is such that the interpolated function is monotonically decreasing
...In Figure 7
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| 150 |
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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| 10 |
In the past there has been much debate about the validity of evaluations based on relevance judgments provided by erring human beings
...Effectiveness and efficiency Much of the research and development in information retrieval is aimed at improving the effectiveness and efficiency of retrieval
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