Mplus VERSION 8.8
MUTHEN & MUTHEN
04/19/2022 10:23 PM
INPUT INSTRUCTIONS
title: this is an example of a 2-group twin model
montecarlo:
names = y1 y2;
ngroups = 2;
nobs = 1000 1000;
nreps = 1;
save = ex5.21.dat;
model population:
[y1-y2*0];
y1-y2*1;
y1 WITH y2*0.73; ! Value for MZ twins
model population-g2:
y1 WITH y2*0.41; ! Value for DZ twins
model:
[y1-y2*0] (1);
y1-y2*1 (var);
y1 WITH y2*0.73(covmz);
model g2:
y1 WITH y2*0.41(covdz);
model constraint:
NEW(a*.8 c*.3 e*.52 h*.64);
var = a**2 + c**2 + e**2;
covmz = a**2 + c**2;
covdz = 0.5*a**2 + c**2;
h = a**2/(a**2 + c**2 + e**2);
output:
tech9;
INPUT READING TERMINATED NORMALLY
this is an example of a 2-group twin model
SUMMARY OF ANALYSIS
Number of groups 2
Number of observations
Group G1 1000
Group G2 1000
Total sample size 2000
Number of replications
Requested 1
Completed 1
Value of seed 0
Number of dependent variables 2
Number of independent variables 0
Number of continuous latent variables 0
Observed dependent variables
Continuous
Y1 Y2
Estimator ML
Information matrix OBSERVED
Maximum number of iterations 1000
Convergence criterion 0.500D-04
Maximum number of steepest descent iterations 20
SAMPLE STATISTICS FOR THE FIRST REPLICATION
SAMPLE STATISTICS FOR G1
Means
Y1 Y2
________ ________
0.013 0.035
Covariances
Y1 Y2
________ ________
Y1 0.992
Y2 0.759 1.055
Correlations
Y1 Y2
________ ________
Y1 1.000
Y2 0.741 1.000
SAMPLE STATISTICS FOR G2
Means
Y1 Y2
________ ________
-0.017 0.006
Covariances
Y1 Y2
________ ________
Y1 0.984
Y2 0.429 1.042
Correlations
Y1 Y2
________ ________
Y1 1.000
Y2 0.423 1.000
MODEL FIT INFORMATION
Number of Free Parameters 4
Loglikelihood
H0 Value
Mean -5216.004
Std Dev 0.000
Number of successful computations 1
Proportions Percentiles
Expected Observed Expected Observed
0.990 0.000 -5216.004 -5216.004
0.980 0.000 -5216.004 -5216.004
0.950 0.000 -5216.004 -5216.004
0.900 0.000 -5216.004 -5216.004
0.800 0.000 -5216.004 -5216.004
0.700 0.000 -5216.004 -5216.004
0.500 0.000 -5216.004 -5216.004
0.300 0.000 -5216.004 -5216.004
0.200 0.000 -5216.004 -5216.004
0.100 0.000 -5216.004 -5216.004
0.050 0.000 -5216.004 -5216.004
0.020 0.000 -5216.004 -5216.004
0.010 0.000 -5216.004 -5216.004
H1 Value
Mean -5213.423
Std Dev 0.000
Number of successful computations 1
Proportions Percentiles
Expected Observed Expected Observed
0.990 0.000 -5213.423 -5213.423
0.980 0.000 -5213.423 -5213.423
0.950 0.000 -5213.423 -5213.423
0.900 0.000 -5213.423 -5213.423
0.800 0.000 -5213.423 -5213.423
0.700 0.000 -5213.423 -5213.423
0.500 0.000 -5213.423 -5213.423
0.300 0.000 -5213.423 -5213.423
0.200 0.000 -5213.423 -5213.423
0.100 0.000 -5213.423 -5213.423
0.050 0.000 -5213.423 -5213.423
0.020 0.000 -5213.423 -5213.423
0.010 0.000 -5213.423 -5213.423
Information Criteria
Akaike (AIC)
Mean 10440.008
Std Dev 0.000
Number of successful computations 1
Proportions Percentiles
Expected Observed Expected Observed
0.990 0.000 10440.008 10440.008
0.980 0.000 10440.008 10440.008
0.950 0.000 10440.008 10440.008
0.900 0.000 10440.008 10440.008
0.800 0.000 10440.008 10440.008
0.700 0.000 10440.008 10440.008
0.500 0.000 10440.008 10440.008
0.300 0.000 10440.008 10440.008
0.200 0.000 10440.008 10440.008
0.100 0.000 10440.008 10440.008
0.050 0.000 10440.008 10440.008
0.020 0.000 10440.008 10440.008
0.010 0.000 10440.008 10440.008
Bayesian (BIC)
Mean 10462.411
Std Dev 0.000
Number of successful computations 1
Proportions Percentiles
Expected Observed Expected Observed
0.990 0.000 10462.411 10462.411
0.980 0.000 10462.411 10462.411
0.950 0.000 10462.411 10462.411
0.900 0.000 10462.411 10462.411
0.800 0.000 10462.411 10462.411
0.700 0.000 10462.411 10462.411
0.500 0.000 10462.411 10462.411
0.300 0.000 10462.411 10462.411
0.200 0.000 10462.411 10462.411
0.100 0.000 10462.411 10462.411
0.050 0.000 10462.411 10462.411
0.020 0.000 10462.411 10462.411
0.010 0.000 10462.411 10462.411
Sample-Size Adjusted BIC (n* = (n + 2) / 24)
Mean 10449.703
Std Dev 0.000
Number of successful computations 1
Proportions Percentiles
Expected Observed Expected Observed
0.990 0.000 10449.703 10449.703
0.980 0.000 10449.703 10449.703
0.950 0.000 10449.703 10449.703
0.900 0.000 10449.703 10449.703
0.800 0.000 10449.703 10449.703
0.700 0.000 10449.703 10449.703
0.500 0.000 10449.703 10449.703
0.300 0.000 10449.703 10449.703
0.200 0.000 10449.703 10449.703
0.100 0.000 10449.703 10449.703
0.050 0.000 10449.703 10449.703
0.020 0.000 10449.703 10449.703
0.010 0.000 10449.703 10449.703
Chi-Square Test of Model Fit
Degrees of freedom 6
Mean 5.161
Std Dev 0.000
Number of successful computations 1
Proportions Percentiles
Expected Observed Expected Observed
0.990 1.000 0.872 5.161
0.980 1.000 1.134 5.161
0.950 1.000 1.635 5.161
0.900 1.000 2.204 5.161
0.800 1.000 3.070 5.161
0.700 1.000 3.828 5.161
0.500 0.000 5.348 5.161
0.300 0.000 7.231 5.161
0.200 0.000 8.558 5.161
0.100 0.000 10.645 5.161
0.050 0.000 12.592 5.161
0.020 0.000 15.033 5.161
0.010 0.000 16.812 5.161
RMSEA (Root Mean Square Error Of Approximation)
Mean 0.000
Std Dev 0.000
Number of successful computations 1
Cumulative Distribution Function
Value Function Value
0.990 1.000
0.980 1.000
0.950 1.000
0.900 1.000
0.800 1.000
0.700 1.000
0.500 1.000
0.300 1.000
0.200 1.000
0.100 1.000
0.050 1.000
0.020 1.000
0.010 1.000
CFI/TLI
CFI
Mean 1.000
Std Dev 0.000
Number of successful computations 1
Cumulative Distribution Function
Value Function Value
0.990 0.000
0.980 0.000
0.950 0.000
0.900 0.000
0.800 0.000
0.700 0.000
0.500 0.000
0.300 0.000
0.200 0.000
0.100 0.000
0.050 0.000
0.020 0.000
0.010 0.000
TLI
Mean 1.000
Std Dev 0.000
Number of successful computations 1
Cumulative Distribution Function
Value Function Value
0.990 0.000
0.980 0.000
0.950 0.000
0.900 0.000
0.800 0.000
0.700 0.000
0.500 0.000
0.300 0.000
0.200 0.000
0.100 0.000
0.050 0.000
0.020 0.000
0.010 0.000
SRMR (Standardized Root Mean Square Residual)
Mean 0.103
Std Dev 0.000
Number of successful computations 1
Cumulative Distribution Function
Value Function Value
0.990 1.000
0.980 1.000
0.950 1.000
0.900 1.000
0.800 1.000
0.700 1.000
0.500 1.000
0.300 1.000
0.200 1.000
0.100 0.000
0.050 0.000
0.020 0.000
0.010 0.000
MODEL RESULTS
ESTIMATES S. E. M. S. E. 95% % Sig
Population Average Std. Dev. Average Cover Coeff
Group G1
Y1 WITH
Y2 0.730 0.7530 0.0000 0.0278 0.0005 1.000 1.000
Means
Y1 0.000 0.0079 0.0000 0.0200 0.0001 1.000 0.000
Y2 0.000 0.0079 0.0000 0.0200 0.0001 1.000 0.000
Variances
Y1 1.000 1.0180 0.0000 0.0263 0.0003 1.000 1.000
Y2 1.000 1.0180 0.0000 0.0263 0.0003 1.000 1.000
Group G2
Y1 WITH
Y2 0.410 0.4320 0.0000 0.0309 0.0005 1.000 1.000
Means
Y1 0.000 0.0079 0.0000 0.0200 0.0001 1.000 0.000
Y2 0.000 0.0079 0.0000 0.0200 0.0001 1.000 0.000
Variances
Y1 1.000 1.0180 0.0000 0.0263 0.0003 1.000 1.000
Y2 1.000 1.0180 0.0000 0.0263 0.0003 1.000 1.000
New/Additional Parameters
A 0.800 0.8012 0.0000 0.0346 0.0000 1.000 1.000
C 0.300 0.3332 0.0000 0.0776 0.0011 1.000 1.000
E 0.520 0.5148 0.0000 0.0114 0.0000 1.000 1.000
H 0.640 0.6306 0.0000 0.0533 0.0001 1.000 1.000
QUALITY OF NUMERICAL RESULTS
Average Condition Number for the Information Matrix 0.956E-04
(ratio of smallest to largest eigenvalue)
TECHNICAL OUTPUT
PARAMETER SPECIFICATION FOR G1
NU
Y1 Y2
________ ________
1 1
THETA
Y1 Y2
________ ________
Y1 2
Y2 3 2
PARAMETER SPECIFICATION FOR G2
NU
Y1 Y2
________ ________
1 1
THETA
Y1 Y2
________ ________
Y1 2
Y2 4 2
PARAMETER SPECIFICATION FOR THE ADDITIONAL PARAMETERS
New/Additional Parameters
A C E H
________ ________ ________ ________
5 6 7 8
STARTING VALUES FOR G1
NU
Y1 Y2
________ ________
0.000 0.000
THETA
Y1 Y2
________ ________
Y1 1.000
Y2 0.730 1.000
STARTING VALUES FOR G2
NU
Y1 Y2
________ ________
0.000 0.000
THETA
Y1 Y2
________ ________
Y1 1.000
Y2 0.410 1.000
STARTING VALUES FOR THE ADDITIONAL PARAMETERS
New/Additional Parameters
A C E H
________ ________ ________ ________
0.800 0.300 0.520 0.640
POPULATION VALUES FOR G1
NU
Y1 Y2
________ ________
0.000 0.000
THETA
Y1 Y2
________ ________
Y1 1.000
Y2 0.730 1.000
POPULATION VALUES FOR G2
NU
Y1 Y2
________ ________
0.000 0.000
THETA
Y1 Y2
________ ________
Y1 1.000
Y2 0.410 1.000
TECHNICAL 9 OUTPUT
Error messages for each replication (if any)
SAVEDATA INFORMATION
Order of variables
Y1
Y2
GROUP
Save file
ex5.21.dat
Save file format Free
Save file record length 10000
Beginning Time: 22:23:05
Ending Time: 22:23:05
Elapsed Time: 00:00:00
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