lecture14_s10 GM2 - General structural model Part 2 RAM...

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General structural model – Part 2: RAM, special constraints and instrumental variables Psychology 588: Covariance structure and factor models March 31, 2010
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Alternative representation 2 LISREL notation does not allow: ¾ Loadings from ξ to y or η to x , or from an indicator to another ¾ Covariances between different kinds of error terms (e.g., between δ and ε ) These “unacceptable” parameters are a limitation of the LISREL notation, not genuine limitation of SEM Reticular Action Model (RAM) provides an alternative, apparently a more general SEM representation
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