AN EVALUATION OF LINKS AND ROLES USED IN INFORMATION RETRIEVAL.
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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The use of links and roles in an information retrieval system is evaluated. Links and roles are techniques for modifying a basic coordinate indexing method. The purpose of the modification is to reduce the amount of irrelevant information retrieved without losing relevant information. Theory of retrieval is reviewed, mathematical models are discussed, retrieval is described in terms of basic concepts for algebra of sets, and a method of scoring effectiveness is presented. Roles were found inferior to links. Links showed reduction of irrelevant information by over 56 percent while incurring less than five percent loss of relevant information. Author