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is no doubt that stems rather than ordinary word forms are more effective Carroll and Debruyn [19]...In the next sections I shall give a simple discussion of the kind of frequency information that may be used to weight document descriptors and explain the use of automatically constructed term classes to aid retrieval
...Index term weighting Traditionally the two most important factors governing the effectiveness of an index language have been thought to be the exhaustivity of indexing and the specificity of the index language
...For any document,indexing exhaustivity is defined as the number of different topics indexed,and the index language specificity is the ability of the index language to describe topics precisely
...It is of some importance to be able to quantify the notions of indexing exhaustivity and specificity because of the predictable effect they have on retrieval effectiveness
...Quite a few people Sparck Jones [22,23],have attempted to relate these two factors to document collection statistics
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