Finite mixtures of covariance structure models with regressors:Loglikelihood function, minimum distance estimation, fit indices, and a complex example  

Oleh:

Arminger, Gerhard ; Stein, Petra

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Sociological Methods & Research (SMR) vol. 26 no. 02 (Nov. 1997), page 148-182.
Topik: Finite mixture models

Ketersediaan

Perpustakaan PKPM Nomor Panggil: S28 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Models of finite mixtures of normal densities conditional on regressor variables are specified and estimated. The authors consider mixtures of multivariate normals where the expected value for each component depends on non normal regressor variables. The expected values and covariance matrices of the mixture components are parameterized using conditional mean- and covariance-structures. The authors discuss the construction of the likelihood function and outline the estimation of parameters. In addition, they define fit indices and discuss aspects of model specification and modification that are specific to mixtures of mean- and covariance-structures. Finally. they give an empirical example in which they analyze the importance of automobiles to individuals depending on the latent constructs individualism and. ecology-mindedness. It is shown that the sample under consideration comes from three heterogeneous subpopulations. It is demonstrated that each sub population may be characterized by a different mean- and covariance-structure.

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