Using phantom and imaginary latent variables to parameterize constraints in linear structural models
- David RindskopfAffiliated withEducational Psychology, CUNY Graduate Center
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The most widely-used computer programs for structural equation models analysis are the LISREL series of Jöreskog and Sörbom. The only types of constraints which may be made directly are fixing parameters at a constant value and constraining parameters to be equal. Rindskopf (1983) showed how these simple properties could be used to represent models with more complicated constraints, namely inequality constraints on unique variances. In this paper, two new concepts are introduced which enable a much wider variety of constraints to be made. The concepts, “phantom” and “imaginary” latent variables, allow fairly general equality and inequality constraints on factor loadings and structural model coefficients.
- Using phantom and imaginary latent variables to parameterize constraints in linear structural models
Volume 49, Issue 1 , pp 37-47
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- David Rindskopf (1)
- Author Affiliations
- 1. Educational Psychology, CUNY Graduate Center, 33 West 42nd Street, 10036, New York, N.Y.