A Theory of indexing by Gerald Salton

By Gerald Salton

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Furthermore, a direct correlation exists between discrimination value order and document frequency Bk. 3 (b) The terms with average discrimination ranks and discrimination values around zero are those with quite low document frequencies ranging from 1 to 5 for the test collections of Table 17. 025 and 0 in Table 17) aro characterized by the highest document frequencies ranging up to 270 for the collections of 450 documents. The data of Table 17 also show that the class of high-frequency, negative discriminators is fairly small in each case.

Furthermore, a direct correlation exists between discrimination value order and document frequency Bk. 3 (b) The terms with average discrimination ranks and discrimination values around zero are those with quite low document frequencies ranging from 1 to 5 for the test collections of Table 17. 025 and 0 in Table 17) aro characterized by the highest document frequencies ranging up to 270 for the collections of 450 documents. The data of Table 17 also show that the class of high-frequency, negative discriminators is fairly small in each case.

From an experimental viewpoint, two difficulties immediately arise. The first concerns the unavailability in many test environments of a sufficient number of user queries to carry out the interactive process. In the present instance, the information value test had to be abandoned for the MED collection because a sufficient number of user queries could not be found. The second problem is the relatively small number of cooccurring terms between documents and user queries, and thus the limited scope of the term value modifications.

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