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THE DISTRIBUTION OF INDEXING DEPTH IN DOCUMENTATION SYSTEMS

THE DISTRIBUTION OF INDEXING DEPTH IN DOCUMENTATION SYSTEMS Most documentation systems allocate a variable number of descriptors to their documents. From a consideration of indexing as a stochastic process it is suggested that the distribution of indexing depth in such a system might represent samples of a truncated mixed Poisson process. Examination of five different systems showed that indexing depth does appear to be distributed in this manner, since a reasonable fit to negative binomial distributions can be made statistically. Factors in the art of indexing which influence the distribution are discussed. As a first approximation the distribution of indexing depth, i, of a system, or of any subset of descriptors in it, is simple Poisson, pi emmii, where m is the average depth of indexing. The results contradict previous reports that a lognormal distribution of indexing depth is to be expected. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Documentation Emerald Publishing

THE DISTRIBUTION OF INDEXING DEPTH IN DOCUMENTATION SYSTEMS

Journal of Documentation , Volume 30 (4): 10 – Apr 1, 1974

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0022-0418
DOI
10.1108/eb026586
Publisher site
See Article on Publisher Site

Abstract

Most documentation systems allocate a variable number of descriptors to their documents. From a consideration of indexing as a stochastic process it is suggested that the distribution of indexing depth in such a system might represent samples of a truncated mixed Poisson process. Examination of five different systems showed that indexing depth does appear to be distributed in this manner, since a reasonable fit to negative binomial distributions can be made statistically. Factors in the art of indexing which influence the distribution are discussed. As a first approximation the distribution of indexing depth, i, of a system, or of any subset of descriptors in it, is simple Poisson, pi emmii, where m is the average depth of indexing. The results contradict previous reports that a lognormal distribution of indexing depth is to be expected.

Journal

Journal of DocumentationEmerald Publishing

Published: Apr 1, 1974

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