, Volume 37, Issue 1, pp 53–59 | Cite as

Local dependence latent structure models

  • Dean Harper


A local independence latent structure model, which assumesm latent classes, requires a minimum of 2m-1 items for the solution of the 2m2 latent parameters. If one adds 3 items to the test and if one assumes local “dependence” between pairs of items, thereby adding\(\left( {\begin{array}{*{20}c} {2m + 2} \\ 2 \\ \end{array} } \right)\) additional latent parameters, ξ ij , representing the association between itemsi andj, then it is possible to obtain estimates for all of the latent parameters: latent class frequencies latent probabilities, and measures of association between pairs of items. The solution consists of (1) forming (m + 1) × (m + 1) matrices of manifest data, which are singular, (2) solving for the ξ ij in equations that result from the singularity of the data matrices, (3) “correcting” the manifest data by removing the “contamination” due to local dependence, and (4) estimating the remaining latent parameters from the corrected data, using methods outlined in earlier literature.


Public Policy Statistical Theory Latent Structure Latent Class Early Literature 
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  1. Anderson, T. W. On estimation of parameters in latent structure analysis.Psychometrika, 1954,19, 1–10.Google Scholar
  2. Lazarsfeld, P. F. and Henry, N.Latent structure analysis. Boston: Houghton Mifflin, 1968.Google Scholar

Copyright information

© Psychometric Society 1972

Authors and Affiliations

  • Dean Harper
    • 1
  1. 1.University of RochesterUK

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