| Message/Author |
|
|
|
|
Dear sir,
I was trying to do a simulation study on reliability estimation. I generate a bi-factor ESEM model and used the same model to fit the data, but the fix indexes are very poor (CFI TLI <0.5,>0.3). I ran several models and it all get the same result. Could you please check the following code for example?
Data generation code:
MODEL POPULATION:
[x1-x10@0];
x1-x10@1;
g@1;
f1-f2@1;
g WITH f1-f2@0;
f1 WITH f2@0;
g by x1-x10@0.4;
f1 by x1-x5@0.3;
f2 by x6-x10@0.3;
f1 by x6-x10@0.001;
f2 by x1-x5@0.001;
Data analysis code: (output)
MODEL:
g WITH f1-f2@0;
f1 WITH f2@0;
g@1;
f1-f2@1;
g by x1-x10@0.4;
f1 by x1-x5@0.3;
f2 by x6-x10@0.3;
f1 by x6-x10@0.001;
f2 by x1-x5@0.001;
VAR(VARX);
RMSEA 0.494; CFI 0.039; TLI 0.039 |
|
|
|
|
| In your Model command you should not fix all parameters - for parameters you want to estimate, you want to change @ to *. |
|
|
| Gabriella Fu posted on Thursday, November 08, 2018 - 7:03 pm
|
|
|
Thank you for your reply.
I changed the analysis code to the following (the label is for calculation):
ANALYSIS:
ROTATION=BI-GEOMIN(ORTHOGONAL);
ITERATIONS=10000;
MODEL:
g by x1-x10*(l1-l10);
f1-f2 by x1-x10(*1);
f1 by x1-x10*(la1-la10);
f2 by x1-x10*(lb1-lb10);
x1-x10(v1-v10);
g@1;
g WITH f1-f2@0;
I repulicate the model 500 times and not once did the model converge to a proper solution. Is there something wrong with the code? |
|
|
| Gabriella Fu posted on Thursday, November 08, 2018 - 7:08 pm
|
|
|
Mostly the error reads:
NO CONVERGENCE. NUMBER OF ITERATIONS EXCEEDED.
WARNING: THE RESIDUAL COVARIANCE MATRIX (THETA) IS NOT POSITIVE DEFINITE.
THIS COULD INDICATE A NEGATIVE VARIANCE/RESIDUAL VARIANCE FOR AN OBSERVED
VARIABLE, A CORRELATION GREATER OR EQUAL TO ONE BETWEEN TWO OBSERVED
VARIABLES, OR A LINEAR DEPENDENCY AMONG MORE THAN TWO OBSERVED VARIABLES.
CHECK THE RESULTS SECTION FOR MORE INFORMATION.
PROBLEM INVOLVING VARIABLE X3.
THE CHI-SQUARE STATISTIC IS NEGATIVE.
THE LOGLIKELIHOOD VALUES MAY NOT BE RELIABLE. |
|
|
|
|
| Send your output to Support along with your license number. |
|
|
| Back to top |
