Accession Number : AD0737042

Title :   Document Retrieval Systems,

Corporate Author : ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s) : Mark,Edward Abraham

Report Date : JAN 1972

Pagination or Media Count : 119

Abstract : Some of the mathematical properties of a term matching information retrieval system are investigated. It is shown that the common retrieval method of using a query vector, a matching function, and a threshold is equivalent to retrieving documents by requiring that a specific mathematical combination of the over and under indexing errors between the query vector and document index vector is bounded. Furthermore, the over and under indexing error set provides a sample space for a probabilistic description of the retrieval process. Using this approach an explicit form of the expected recall ratio is derived. (Author)

Descriptors :   (*INFORMATION RETRIEVAL, MATHEMATICAL ANALYSIS), SUBJECT INDEXING, MATHEMATICAL ANALYSIS, THESES

Subject Categories : Information Science

Distribution Statement : APPROVED FOR PUBLIC RELEASE