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Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

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CHAPTER 7EXAMPLE 7.28: TWO-GROUP TWIN MODEL FORCATEGORICAL OUTCOMES USING MAXIMUMLIKELIHOOD AND PARAMETER CONSTRAINTSTITLE: this is an example of a two-group twinmodel for categorical outcomes usingmaximum likelihood and parameterconstraintsDATA: FILE = ex7.28.dat;VARIABLE: NAMES = u1 u2 dz;CATEGORICAL = u1 u2;CLASSES = cdz (2);KNOWNCLASS = cdz (dz = 0 dz = 1);ANALYSIS: TYPE = MIXTURE;ALGORITHM = INTEGRATION;LINK = PROBIT;MODEL:%OVERALL%[u1$1-u2$1] (1);f1 BY u1;f2 BY u2;[f1-f2@0];f1-f2 (varf);%cdz#1%f1 WITH f2(covmz);%cdz#2%f1 WITH f2(covdz);MODEL CONSTRAINT:NEW(a c h);varf = a**2 + c**2 + .001;covmz = a**2 + c**2;covdz = 0.5*a**2 + c**2;h = a**2/(a**2 + c**2 + 1);188

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