lecture11_s10 GM1

lecture11_s10 GM1 - General structural model Part 1:...

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General structural model – Part 1: Covariance structure and identification Psychology 588: Covariance structure and factor models Mar 5, 2010
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Latent variables 2 • Interchangeably used: ¾ constructs --- substantively defined concepts ¾ common factors or components --- something uncorrelated with errors (cf. case of cause indicators) ¾ true scores by measurement theory • Generality vs. specificity --- latent variables are operationally defined to underlie a set of indicators, implying wider generalizability than what is intended by each indicator • Good indicators ¾ represent distinctive aspects of a defined concept ¾ reasonably inter-correlated (i.e., internally reliable) ¾ factorially simple; ideally uni-factorial
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General structural models 3 • General SE models combine: ¾ measurement models that operationally define a set of theoretical concepts, allowing for fallible measurement, with ¾ a path model that explains complex relationships among a set of (mostly) latent variables • All forms of models considered so far are special cases of GM (e.g., path models only with observed variables, CFA, MIMIC, etc.) --- rules and principles considered so far apply only to a part of GM, and so we will consider ways of combining them as well
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lecture11_s10 GM1 - General structural model Part 1:...

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