Accession Number : AD0731037

Title :   NORMIX 360 Computer Program.

Descriptive Note : Research memorandum rept.,

Corporate Author : NAVAL PERSONNEL AND TRAINING RESEARCH LAB SAN DIEGO CALIF

Personal Author(s) : Wolfe,John H.

Report Date : SEP 1971

Pagination or Media Count : 123

Abstract : The report gives the documentation, listing, and printouts of a sample run for the NORMIX 360 computer program. The program seeks maximum-likelihood estimates of the parameters of a mixture of multivariate normal distributions. The likelihood equations are solved iteratively by continually re-estimating the probability of membership of each sample point in each cluster until the likelihood reaches a relative maximum. The initial estimates are derived from a minimum-variance hierarchial grouping subroutine, which itself is iterative in seeking an appropriate distance function. The program prints out the means, standard deviations and inter-correlations of the variables within clusters, and the proportions of the population for each cluster. The probabilities of membership of each point in each cluster are also printed. (Author)

Descriptors :   (*COMPUTER PROGRAMS, *INSTRUCTION MANUALS), STATISTICAL DISTRIBUTIONS, SAMPLING, PATTERN RECOGNITION

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE