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Published online by Cambridge University Press: 01 January 2025
The existing maximum likelihood theory and its computer software in structural equation modeling are established based on linear relationships among manifest variables and latent variables. However, models with nonlinear relationships are often encountered in social and behavioral sciences. In this article, an EM type algorithm is developed for maximum likelihood estimation of a general nonlinear structural equation model. To avoid computation of the complicated multiple integrals involved, the E-step is completed by a Metropolis-Hastings algorithm. It is shown that the M-step can be completed efficiently by simple conditional maximization. Standard errors of the maximum likelihood estimates are obtained via Louis's formula. The methodology is illustrated with results from a simulation study and two real examples.
The order of the authorship is alphabetical. This research is fully supported by a Hong Kong UGC Earmarked grant CUHK 4088/99H. The authors are indebted to the Editor, Associate Editor and anonymous reviewers for valuable comments for improving the paper; and also to ICPSR and the relevant funding agency for allowing use of the data. We thank Xin-Yuan Song, N.H. Tang and Liang Xu for helpful discussions. Assistance of Xin-Yuan Song and Michael K. H. Leung in analyzing the real examples and Esther L.S. Tam in preparing the manuscript is also acknowledged.