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## Confirmatory Factor Analysis

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**Confirmatory Factor Analysis**SPSS/AMOS**The WISC, Verbal IQ**• INFOrmation – general knowledge questions • COMPrehension – of social situations and common concepts • ARITHmetic • SIMILarities – how are two words similar • VOCABulary • DIGITspan – repeating strings of digits after hearing them**The WISC, Performance IQ**• PICTureCOMPletion – identify the missing part • PictureARrANGement – arrange pictures to tell a story. • BLOCK design – arrange blocks to match model. • OBJECT assembly – puzzles involvement arrangement into a whole • CODING – associate simple shapes with symbols coding them**Download From BlackBoard**• CFA-WISC.sav • CFA-Wisc.amw • CFA-Wisc2.amw • CFA-Wisc-Amos-Output.doc • Bring CFA-WISC into SPSS • Analyze, AMOS**AMOS**• Open, CFA-Wisc.amw • Select Data Files, Working, View Data, OK • Analysis Properties • Minimization history • Standardized estimates • Squared multiple correlations • Residual moments • Modification indices**Calculate Estimates**• View the output path diagram • Standardized • View Text (Output)**Text Output**• Chi-square = 70.236 • Degrees of freedom = 43 • Probability level = .005 • Poor fit or just too much power?**Standardized Residual Covariances**Large residuals for Comp-Pictcomp and Digit-Coding.**Fit**• GFI = .931 • CFI = .941 • RMSEA = .06 • Fit is not bad.**Modification Indices**I am going to add a path from Performance to COMP.**2 Dropped Significantly**• Chi-square = 60.295 • Degrees of freedom = 42 • Probability level = .033 • Change in 2 = (70.326 – 20.295) = 9.94 • On 1 df, is significant.**Better Fit**• GFI = .942, had been .931 • CFI = .960, had been .941 • RMSEA = .050, had been .060**Regression Weights**• The path to CODING is not significant. I am going to eliminate CODING.**2 No Longer Significant**• Chi-square = 45.018 • Degrees of freedom = 33 • Probability level = .079**Yet Better Fit**• GFI = .952, had been .942 • CFI = .974, had been .960 • RMSEA = .046, had been .050