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Published byKira Hardwick Modified about 1 year ago

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Confirmatory Factor Analysis Intro

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Factor Analysis Exploratory –Principle components –Rotations Confirmatory –Split sample –Structural equations

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Structural Equation Approach Structural equation or covariance structure models

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Components Latent variables (endogenous) Manifest variables (exogenous) Residual variables Covariances Influences

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Path Diagrams (components) Observed Variable Latent Variable Influence Path Covariance between exogenous variables or errors E1 Residual or Error

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Path Diagram for Multiple Regression y = a0 + a1*x1 +a2*x2 + a3*x3 + a4*x4 + e1 X4 X1 X3 X2 Y E1

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Regression All variables are manifest One error term All covariances allowed among independent variables

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Two Factor Confirmatory Path Model F1F2 V1V2V3V4V5V6 E1

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Confirmatory Model F1 and F2 correlated (oblique) Components of F1 and F2 are separate indicator variables

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Example Y = v + e1 X = u + e2 X’ = u + e3 X, Y & X’ are manifest U, V are latent e1, e2, e3 are residual/errors e1, e2, e3 independent with mean = 0 e2, e3, u uncorrelated e1, v uncorrelated

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Example Covariance YXX’ YVar(Y)= Var(v) + Var(e1) XCov(XY) = Cov(uv) Var(X) = Var(u) + Var(e2) X’Cov(X’Y) = Cov(uv) Cov(X/X) = Var(u) Var(X’) = Var(u) + Var(e3)

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FACTOR Model Specification You can specify the FACTOR statement to compute factor loadings F and unique variances U of an exploratory or confirmatory first-order factor (or component) analysis. By default, the factor correlation matrix P is an identity matrix. C = FF’ + U, U = diag C = data covariance matrix

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First-order Confirmatory Factor Analysis For a first-order confirmatory factor analysis, you can use MATRIX statements to define elements in the matrices F, P, and U of the more general model C = FPF' + U, P = P', U = diag factor loadings F unique variances U factor correlation matrix P data covariance matrix C

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PROC FACTOR RESIDUALS / RES –displays the residual correlation matrix and the associated partial correlation matrix. The diagonal elements of the residual correlation matrix are the unique variances.

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