| Similarity |
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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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| 167 |
the possible ordering of this set is ignored
...Now,an intuitive way of measuring the adequacy of the retrieved set is to measure the size of the shaded area
...which is a simple composite measure
...The preceding argument in itself is not sufficient to justify the use of this particular composite measure
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| 146 |
There has been much debate in the past as to whether precision and recall are in fact the appropriate quantities to use as measures of effectiveness
...1 the most commonly used pair;2 fairly well understood quantities
...The final question How to evaluate?has a large technical answer
...Before proceeding to the technical details relating to the measurement of effectiveness it is as well to examine more closely the concept of relevance which underlies it
...Relevance Relevance is a subjective notion
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