Abstract
Nonlinear structural equation models with nonignorable missing outcomes from reproductive dispersion models are proposed to identify the relationship between manifest variables and latent variables in modern educational, medical, social and psychological studies. The nonignorable missing mechanism is specified by a logistic regression model. An EM algorithm is developed to obtain the maximum likelihood estimates of the structural parameters and parameters in the logistic regression model. Assessment of local influence is investigated in nonlinear structural equation models with nonignorable missing outcomes from reproductive dispersion models on the basis of the conditional expectation of the complete-data log-likelihood function. Some local influence diagnostics are obtained via observations of missing data and latent variables that are generated by the Gibbs sampler and Metropolis–Hastings algorithm on the basis of the conformal normal curvature. A simulation study and a real example are used to illustrate the application of the proposed methodologies.
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