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07_AlternativeTimeMetrics_022410

07_AlternativeTimeMetrics_022410 - HDFS 597K Longitudinal...

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1 ALTERNATIVE TIME METRICS: ReCentering ReScaling ReThinking HDFS 597K February 24, 2010 HDFS 597K Applied Longitudinal Data Analysis ReCentering, ReScaling, ReThinking Longitudinal Plot of WISC Verbal No Growth Model Predicted Curves What is the equation? SAS Script for No Growth Model TITLE1 'No Growth Model - Variance in Intercept' ; PROC MIXED DATA =wisclong NOCLPRINT COVTEST; CLASS id; MODEL verb = / SOLUTION DDFM =BW NOTEST CHISQ OUTP =nogrowpred; RANDOM INTERCEPT / SUBJECT =id TYPE =UN; RUN ; Covariance Parameter Estimates Standard Z Cov Parm Subject Estimate Error Value Pr Z UN(1,1) id 13.0076 4.8197 2.70 0.0035 Residual 127.73 7.3017 17.49 <.0001 Fit Statistics -2 Res Log Likelihood 6341.6 AIC (smaller is better) 6345.6 AICC (smaller is better) 6345.6 BIC (smaller is better) 6352.3 Solution for Fixed Effects Standard Effect Estimate Error DF t Value Pr > |t| Intercept 30.3395 0.4694 203 64.64 <.0001 Relative Model Fit Model A Model B Model C NoGrowth Linear Latent df 11 parms 3 -2LL 6342 χ 2 1382 RMSEA 0.78 Δ df (vs. A) -- Δχ 2 (vs. A) -- Predicted Linear Growth Curves What is the equation?
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