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Introduction to Structural Equations with Latent Variables

Model Specification

PROC CALIS provides several ways to specify a model. Structural equations can be transcribed directly in the LINEQS statement. A path diagram can be described in the RAM statement. You can specify a first-order factor model in the FACTOR and MATRIX statements. Higher-order factor models and other complicated models can be expressed in the COSAN and MATRIX statements. For most applications, the LINEQS and RAM statements are easiest to use; the choice between these two statements is a matter of personal preference.

You can save a model specification in an OUTRAM= data set, which can then be used with the INRAM= option to specify the model in a subsequent analysis.

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