```Mplus VERSION 2.12
MUTHEN & MUTHEN
04/28/2003  12:55 PM

INPUT INSTRUCTIONS

TITLE:          2-group Univariate Twin Model for a Binary Variable WITH THETA p

DATA:       FILE = example1.dat;

VARIABLE:         NAMES = famno zyg y1 y2;
USEVARIABLEs = y1 y2;
GROUP = zyg(1=mz 2=dz);
CATEGORICAL = y1 y2;

DEFINE:     CUT y1(110); CUT y2(110);

ANALYSIS:         TYPE = MEANSTRUCTURE;
PARAM = THETA;

MODEL:                                                          ! set up values
[y1\$1@1.071]; [y2\$1@1.071];                          ! estimated in prior run

c1 BY y1*.3 (12); c2 BY y2*.3 (12);     ! common envt loadings
e1 BY y1*.8 (13); e2 BY y2*.8 (13);     ! specific envt loadings

[a1@0 a2@0 c1@0 c2@0 e1@0 e2@0];                  ! fix latent variable means=0
a1@1 a2@1 c1@1 c2@1 e1@1 e2@1;                   ! fix latent variable vars=1
a1-a2 WITH c1-e2@0;                                         ! latent variable
c1-c2 WITH e1-e2@0;
a1 WITH a2@1; c1 WITH c2@1; e1 WITH e2@0;

MODEL mz:
y1@0; y2@0;                ! note this must be specified for each group

MODEL dz:
y1@0; y2@0;
a1 WITH a2@0.5;

OUTPUT: SAMP RES STAND;

2-group Univariate Twin Model for a Binary Variable WITH THETA pa

SUMMARY OF ANALYSIS

Number of groups                                          2
Number of observations
Group MZ                                            1000
Group DZ                                            1000

Number of y-variables                                     2
Number of x-variables                                     0
Number of continuous latent variables                     6

Observed variables in the analysis
Y1          Y2

Grouping variable     ZYG

Categorical variables
Y1          Y2

Continuous latent variables in the analysis
A1          A2          C1          C2          E1          E2

Estimator                                             WLSMV
Maximum number of iterations                           1000
Convergence criterion                             0.500D-04
Parameterization                                      THETA

Input data file(s)
example1.dat

Input data format  FREE

SAMPLE STATISTICS

ESTIMATED SAMPLE STATISTICS FOR MZ

SAMPLE THRESHOLDS
Y1\$1          Y2\$1
________      ________
1         1.054         1.098

SAMPLE TETRACHORIC CORRELATIONS
Y1            Y2
________      ________
Y1
Y2             0.581

ESTIMATED SAMPLE STATISTICS FOR DZ

SAMPLE THRESHOLDS
Y1\$1          Y2\$1
________      ________
1         1.094         1.041

SAMPLE TETRACHORIC CORRELATIONS
Y1            Y2
________      ________
Y1
Y2             0.323

THE MODEL ESTIMATION TERMINATED NORMALLY

TESTS OF MODEL FIT

Chi-Square Test of Model Fit

Value                              1.126*
Degrees of Freedom                     3**
P-Value                           0.7705

*  The chi-square value for MLM, MLR, MLMV, WLSM and WLSMV cannot be used for
chi-square difference tests.  MLM and MLR chi-square difference testing is
described on page 360 in the Mplus User's Guide.

** The degrees of freedom for MLMV and WLSMV are estimated according to
formula 110 (page 358) in the Mplus User's Guide.

Chi-Square Test of Model Fit for the Baseline Model

Value                            149.825
Degrees of Freedom                     2
P-Value                           0.0000

CFI/TLI

CFI                                1.000
TLI                                1.008

RMSEA (Root Mean Square Error Of Approximation)

Estimate                           0.000

WRMR (Weighted Root Mean Square Residual)

Value                              0.587

MODEL RESULTS

Estimates     S.E.  Est./S.E.    Std     StdYX

Group MZ

A1       BY
Y1                 0.718    0.118      6.067    0.718    0.718

A2       BY
Y2                 0.718    0.118      6.067    0.718    0.718

C1       BY
Y1                 0.255    0.278      0.919    0.255    0.255

C2       BY
Y2                 0.255    0.278      0.919    0.255    0.255

E1       BY
Y1                 0.647    0.042     15.379    0.647    0.647

E2       BY
Y2                 0.647    0.042     15.379    0.647    0.647

A1       WITH
C1                 0.000    0.000      0.000    0.000    0.000
C2                 0.000    0.000      0.000    0.000    0.000
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000
A2                 1.000    0.000      0.000    1.000    1.000

A2       WITH
C1                 0.000    0.000      0.000    0.000    0.000
C2                 0.000    0.000      0.000    0.000    0.000
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000

C1       WITH
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000
C2                 1.000    0.000      0.000    1.000    1.000

C2       WITH
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000

E1       WITH
E2                 0.000    0.000      0.000    0.000    0.000

Means
A1                 0.000    0.000      0.000    0.000    0.000
A2                 0.000    0.000      0.000    0.000    0.000
C1                 0.000    0.000      0.000    0.000    0.000
C2                 0.000    0.000      0.000    0.000    0.000
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000

Thresholds
Y1\$1               1.071    0.000      0.000    1.071    1.071
Y2\$1               1.071    0.000      0.000    1.071    1.071

Variances
A1                 1.000    0.000      0.000    1.000    1.000
A2                 1.000    0.000      0.000    1.000    1.000
C1                 1.000    0.000      0.000    1.000    1.000
C2                 1.000    0.000      0.000    1.000    1.000
E1                 1.000    0.000      0.000    1.000    1.000
E2                 1.000    0.000      0.000    1.000    1.000

Residual Variances
Y1                 0.000    0.000      0.000    0.000    0.000
Y2                 0.000    0.000      0.000    0.000    0.000

Group DZ

A1       BY
Y1                 0.718    0.118      6.067    0.718    0.718

A2       BY
Y2                 0.718    0.118      6.067    0.718    0.718

C1       BY
Y1                 0.255    0.278      0.919    0.255    0.255

C2       BY
Y2                 0.255    0.278      0.919    0.255    0.255

E1       BY
Y1                 0.647    0.042     15.379    0.647    0.647

E2       BY
Y2                 0.647    0.042     15.379    0.647    0.647

A1       WITH
C1                 0.000    0.000      0.000    0.000    0.000
C2                 0.000    0.000      0.000    0.000    0.000
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000
A2                 0.500    0.000      0.000    0.500    0.500

A2       WITH
C1                 0.000    0.000      0.000    0.000    0.000
C2                 0.000    0.000      0.000    0.000    0.000
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000

C1       WITH
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000
C2                 1.000    0.000      0.000    1.000    1.000

C2       WITH
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000

E1       WITH
E2                 0.000    0.000      0.000    0.000    0.000

Means
A1                 0.000    0.000      0.000    0.000    0.000
A2                 0.000    0.000      0.000    0.000    0.000
C1                 0.000    0.000      0.000    0.000    0.000
C2                 0.000    0.000      0.000    0.000    0.000
E1                 0.000    0.000      0.000    0.000    0.000
E2                 0.000    0.000      0.000    0.000    0.000

Thresholds
Y1\$1               1.071    0.000      0.000    1.071    1.071
Y2\$1               1.071    0.000      0.000    1.071    1.071

Variances
A1                 1.000    0.000      0.000    1.000    1.000
A2                 1.000    0.000      0.000    1.000    1.000
C1                 1.000    0.000      0.000    1.000    1.000
C2                 1.000    0.000      0.000    1.000    1.000
E1                 1.000    0.000      0.000    1.000    1.000
E2                 1.000    0.000      0.000    1.000    1.000

Residual Variances
Y1                 0.000    0.000      0.000    0.000    0.000
Y2                 0.000    0.000      0.000    0.000    0.000

R-SQUARE

Group MZ

Observed   Scale
Variable   Factors  R-Square

Y1           1.000     1.000
Y2           1.000     1.000

Group DZ

Observed   Scale
Variable   Factors  R-Square

Y1           1.000     1.000
Y2           1.000     1.000

RESIDUAL OUTPUT

ESTIMATED MODEL AND RESIDUALS (OBSERVED - ESTIMATED) FOR MZ

Model Estimated Means/Intercepts/Thresholds
Y1\$1          Y2\$1
________      ________
1         1.071         1.071

Residuals for Means/Intercepts/Thresholds
Y1\$1          Y2\$1
________      ________
1        -0.017         0.027

Model Estimated Covariances/Correlations/Residual Correlations
Y1            Y2
________      ________
Y1
Y2             0.581

Residuals for Covariances/Correlations/Residual Correlations
Y1            Y2
________      ________
Y1
Y2             0.000

ESTIMATED MODEL AND RESIDUALS (OBSERVED - ESTIMATED) FOR DZ

Model Estimated Means/Intercepts/Thresholds
Y1\$1          Y2\$1
________      ________
1         1.071         1.071

Residuals for Means/Intercepts/Thresholds
Y1\$1          Y2\$1
________      ________
1         0.023        -0.030

Model Estimated Covariances/Correlations/Residual Correlations
Y1            Y2
________      ________
Y1
Y2             0.323

Residuals for Covariances/Correlations/Residual Correlations
Y1            Y2
________      ________
Y1
Y2             0.000

Beginning Time:  12:55:01
Ending Time:  12:55:01
Elapsed Time:  00:00:00

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Los Angeles, CA  90066

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Support: Support@StatModel.com

Copyright (c) 1998-2002 Muthen & Muthen
```