Mplus VERSION 8.8
MUTHEN & MUTHEN
04/19/2022 11:11 PM
INPUT INSTRUCTIONS
TITLE: this is an example of a two-group
twin model for categorical outcomes where
factors represent the ACE components
DATA: FILE = ex5.19.dat;
VARIABLE: NAMES = u1 u2 g;
CATEGORICAL = u1-u2;
GROUPING = g (1 = mz 2 = dz);
ANALYSIS:MODEL=NOCOVARIANCES;
MODEL: [u1$1-u2$1] (1);
a1 BY u1* (2);
a2 BY u2* (2);
c1 BY u1* (3);
c2 BY u2* (3);
a1-c2@1;
[a1-c2@0];
a1 WITH a2@1;
c1 WITH c2@1;
MODEL dz: a1 WITH a2@.5;
{u1-u2@1};
INPUT READING TERMINATED NORMALLY
this is an example of a two-group
twin model for categorical outcomes where
factors represent the ACE components
SUMMARY OF ANALYSIS
Number of groups 2
Number of observations
Group MZ 1000
Group DZ 1000
Total sample size 2000
Number of dependent variables 2
Number of independent variables 0
Number of continuous latent variables 4
Observed dependent variables
Binary and ordered categorical (ordinal)
U1 U2
Continuous latent variables
A1 A2 C1 C2
Variables with special functions
Grouping variable G
Estimator WLSMV
Maximum number of iterations 1000
Convergence criterion 0.500D-04
Maximum number of steepest descent iterations 20
Parameterization DELTA
Link PROBIT
Input data file(s)
ex5.19.dat
Input data format FREE
UNIVARIATE PROPORTIONS AND COUNTS FOR CATEGORICAL VARIABLES
Group MZ
U1
Category 1 0.502 502.000
Category 2 0.498 498.000
U2
Category 1 0.494 494.000
Category 2 0.506 506.000
Group DZ
U1
Category 1 0.504 504.000
Category 2 0.496 496.000
U2
Category 1 0.511 511.000
Category 2 0.489 489.000
THE MODEL ESTIMATION TERMINATED NORMALLY
WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IN GROUP MZ
IS NOT POSITIVE DEFINITE. THIS COULD INDICATE A NEGATIVE VARIANCE/
RESIDUAL VARIANCE FOR A LATENT VARIABLE, A CORRELATION GREATER OR EQUAL
TO ONE BETWEEN TWO LATENT VARIABLES, OR A LINEAR DEPENDENCY AMONG MORE
THAN TWO LATENT VARIABLES. CHECK THE TECH4 OUTPUT FOR MORE INFORMATION.
PROBLEM INVOLVING VARIABLE A2.
WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IN GROUP DZ
IS NOT POSITIVE DEFINITE. THIS COULD INDICATE A NEGATIVE VARIANCE/
RESIDUAL VARIANCE FOR A LATENT VARIABLE, A CORRELATION GREATER OR EQUAL
TO ONE BETWEEN TWO LATENT VARIABLES, OR A LINEAR DEPENDENCY AMONG MORE
THAN TWO LATENT VARIABLES. CHECK THE TECH4 OUTPUT FOR MORE INFORMATION.
PROBLEM INVOLVING VARIABLE C2.
MODEL FIT INFORMATION
Number of Free Parameters 3
Chi-Square Test of Model Fit
Value 0.905*
Degrees of Freedom 3
P-Value 0.8242
Chi-Square Contribution From Each Group
MZ 0.476
DZ 0.429
* The chi-square value for MLM, MLMV, MLR, ULSMV, WLSM and WLSMV cannot be used
for chi-square difference testing in the regular way. MLM, MLR and WLSM
chi-square difference testing is described on the Mplus website. MLMV, WLSMV,
and ULSMV difference testing is done using the DIFFTEST option.
RMSEA (Root Mean Square Error Of Approximation)
Estimate 0.000
90 Percent C.I. 0.000 0.032
Probability RMSEA <= .05 0.992
CFI/TLI
CFI 1.000
TLI 1.000
Chi-Square Test of Model Fit for the Baseline Model
Value 952.816
Degrees of Freedom 2
P-Value 0.0000
SRMR (Standardized Root Mean Square Residual)
Value 0.005
Optimum Function Value for Weighted Least-Squares Estimator
Value 0.14675290D-03
MODEL RESULTS
Two-Tailed
Estimate S.E. Est./S.E. P-Value
Group MZ
A1 BY
U1 0.848 0.060 14.119 0.000
A2 BY
U2 0.848 0.060 14.119 0.000
C1 BY
U1 0.229 0.199 1.149 0.250
C2 BY
U2 0.229 0.199 1.149 0.250
A1 WITH
A2 1.000 0.000 999.000 999.000
C1 WITH
C2 1.000 0.000 999.000 999.000
Means
A1 0.000 0.000 999.000 999.000
A2 0.000 0.000 999.000 999.000
C1 0.000 0.000 999.000 999.000
C2 0.000 0.000 999.000 999.000
Thresholds
U1$1 0.007 0.024 0.292 0.770
U2$1 0.007 0.024 0.292 0.770
Variances
A1 1.000 0.000 999.000 999.000
A2 1.000 0.000 999.000 999.000
C1 1.000 0.000 999.000 999.000
C2 1.000 0.000 999.000 999.000
Scales
U1 1.000 0.000 999.000 999.000
U2 1.000 0.000 999.000 999.000
Group DZ
A1 BY
U1 0.848 0.060 14.119 0.000
A2 BY
U2 0.848 0.060 14.119 0.000
C1 BY
U1 0.229 0.199 1.149 0.250
C2 BY
U2 0.229 0.199 1.149 0.250
A1 WITH
A2 0.500 0.000 999.000 999.000
C1 WITH
C2 1.000 0.000 999.000 999.000
Means
A1 0.000 0.000 999.000 999.000
A2 0.000 0.000 999.000 999.000
C1 0.000 0.000 999.000 999.000
C2 0.000 0.000 999.000 999.000
Thresholds
U1$1 0.007 0.024 0.292 0.770
U2$1 0.007 0.024 0.292 0.770
Variances
A1 1.000 0.000 999.000 999.000
A2 1.000 0.000 999.000 999.000
C1 1.000 0.000 999.000 999.000
C2 1.000 0.000 999.000 999.000
Scales
U1 1.000 0.000 999.000 999.000
U2 1.000 0.000 999.000 999.000
QUALITY OF NUMERICAL RESULTS
Condition Number for the Information Matrix 0.470E-02
(ratio of smallest to largest eigenvalue)
R-SQUARE
Group MZ
Observed Residual
Variable Estimate Variance
U1 0.771 0.229
U2 0.771 0.229
Group DZ
Observed Residual
Variable Estimate Variance
U1 0.771 0.229
U2 0.771 0.229
Beginning Time: 23:11:17
Ending Time: 23:11:18
Elapsed Time: 00:00:01
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