Accession Number : ADA139299

Title :   Estimation of Latent Group Effects.

Descriptive Note : Psychometric technical rept.,

Corporate Author : NATIONAL OPINION RESEARCH CENTER CHICAGO IL

Personal Author(s) : Mislevy,R J

PDF Url : ADA139299

Report Date : Aug 1983

Pagination or Media Count : 32

Abstract : Conventional methods of multivariate normal analysis do not apply when the variables of interest are not observed directly, but must be inferred from fallible or incomplete data. For example, responses to mental test items may depend upon latent aptitude variables, which modeled in turn as functions of demographic effects in the population. A method of estimating such effects by means of marginal maximum likelihood, implemented by means of an EM algorithm, is proposed. Asymptotic standard errors, likelihood ratio tests of alternative models, and computing approximations are provided. The procedures are illustrated with data for tests from the Armed Services Vocational Aptitude Battery administered to a national probability sample of American youth. (Author)

Descriptors :   *Multivariate analysis, *Population, Statistical distributions, Demography, Normal distribution, Random variables, Response(Biology), Males, Females, Mental ability

Subject Categories : Economics and Cost Analysis
      Sociology and Law
      Psychology
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE