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Bayesian Estimation and Testing of Structural Equation Models

Published online by Cambridge University Press:  01 January 2025

Richard Scheines*
Affiliation:
Department of Philosophy, Carnegie Mellon University
Herbert Hoijtink
Affiliation:
Department of Methodology and Statistics, University of Utrecht, The Netherlands
Anne Boomsma
Affiliation:
Department of Statistics, Measurement Theory, and Information Technology, University of Groningen, The Netherlands
*
Requests for reprints should be sent to Richard Scheines at the Department of Philosophy, Carnegie Mellon University, Pittsburgh, PA, 15213. Email: Scheines@andrew.cmu.edu.

Abstract

The Gibbs sampler can be used to obtain samples of arbitrary size from the posterior distribution over the parameters of a structural equation model (SEM) given covariance data and a prior distribution over the parameters. Point estimates, standard deviations and interval estimates for the parameters can be computed from these samples. If the prior distribution over the parameters is uninformative, the posterior is proportional to the likelihood, and asymptotically the inferences based on the Gibbs sample are the same as those based on the maximum likelihood solution, for example, output from LISREL or EQS. In small samples, however, the likelihood surface is not Gaussian and in some cases contains local maxima. Nevertheless, the Gibbs sample comes from the correct posterior distribution over the parameters regardless of the sample size and the shape of the likelihood surface. With an informative prior distribution over the parameters, the posterior can be used to make inferences about the parameters underidentified models, as we illustrate on a simple errors-in-variables model.

Information

Type
Original Paper
Copyright
Copyright © 1999 The Psychometric Society

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