Author： BOOKSTEIN ABRAHAM
Publisher： Emerald Group Publishing Ltd
ISSN： 0022-0418
Source： Journal of Documentation, Vol.39, Iss.2, 1983-01, pp. : 63-72
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Abstract
For reasons of technical convenience, current retrieval algorithms based on probabilistic reasoning are derived from models that assume patrons evaluate documents using a two value relevance scale. This paper extends the theory by describing a model which includes a more general relevance scale. This model permits a re-examination of the earlier theory as a special case of that developed here and leads to a more satisfying interpretation of the ranking principle of the earlier models.
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