Mplus Users Guide v6.. - Muthén & Muthén

CHAPTER 5EXAMPLE 5.18: TWO-GROUP TWIN MODEL FORCONTINUOUS OUTCOMES WHERE FACTORS REPRESENTTHE ACE COMPONENTSTITLE: this is an example of a two-group twinmodel for continuous outcomes wherefactors represent the ACE componentsDATA: FILE = ex5.18.dat;VARIABLE: NAMES = y1 y2 g;GROUPING = g (1 = mz 2 = dz);ANALYSIS: MODEL = NOCOVARIANCES;MODEL: [y1-y2] (1);y1-y2@0;a1 BY y1* (2);a2 BY y2* (2);c1 BY y1* (3);c2 BY y2* (3);e1 BY y1* (4);e2 BY y2* (4);a1-e2@1;[a1-e2@0];a1 WITH a2@1;c1 WITH c2@1;MODEL dz: a1 WITH a2@.5;y1y2A1C1E1A2C2E2In this example, the univariate twin model shown in the picture above isestimated. This is a two-group twin model for a continuous outcomewhere factors represent the ACE components (Neale & Cardon, 1992).78