Accession Number:

AD0628191

Title:

SOME THEORETICAL ASPECTS OF THE IMPROVEMENT OF DOCUMENT SCREENING BY ASSOCIATIVE TRANSFORMATIONS.

Descriptive Note:

Final rept.,

Corporate Author:

WESTAT RESEARCH ANALYSTS INC DENVER COLO

Report Date:

1965-11-30

Pagination or Media Count:

53.0

Abstract:

With respect to document storage and retrieval, one can think of associative techniques as either 1 those which improve the file, or 2 those which improve the search query. The objective of both is to improve the search outcome. In this study, techniques which improve the file have been considered. The file to which they can be applied is one expressible as a matrix of zeros and ones. Two kinds of files have been considered. In the first kind, it is possible to define a correct indexing and in the second kind whether an index term should or should not be selected is partly a matter of opinion. For the first kind of file, mathematical expressions have been found for the amount by which a person can gain by using associative techniques. An experiment was performed on a small Patent Office file to simulate the second situation. Actual indexings of zero or one were replaced by a weighted average of three associative estimates of the relatedness of the term to the document. Retrieval was shown to be improved in the sense that fewer documents had to be examined in order to discover documents which had been judged relevant in previous Patent Office searches. Greater inconsistency of indexing was introduced into the file by randomization and the searching experiment was repeated. Again, the associative techniques proved to be superior. Author

Subject Categories:

  • Information Science

Distribution Statement:

APPROVED FOR PUBLIC RELEASE