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 Ali posted on Tuesday, July 01, 2014 - 2:54 am
Dear Muthens
I have specified the following montecalo SEM model :
model:
f1 by y1@1 y2-y8*.7;
f2 by y9@1 y10-y14*.7;
f3 by y15@1 y16-y21*.7;
f4 by f1@1 f2-f3*.7;
f5 by y22-y24*.7;
f6 by y25@1 y26-y27*.7;
f6 on f5*.5;
f4 on f5*.3;
f4 on f6*.7;
y1-y27*.3;
f1-f3*1;
f4*.5;
f6*1;
f4*1;
f5*.5;
But I received the following error:
*** FATAL ERROR
THE POPULATION COVARIANCE MATRIX THAT YOU GAVE
AS INPUT IS NOT POSITIVE DEFINITE AS IT SHOULD BE.
I'm not sure where I went wrong. I would appreciate your help
 Bengt O. Muthen posted on Tuesday, July 01, 2014 - 10:03 am
The error message refers to your Model Population command not your Model command. Often it implies that you have a zero variance, perhaps one not mentioned.

If that doesn't help, send to Support.
 Ali posted on Tuesday, July 01, 2014 - 9:32 pm
The Population command is exactly the same as the Model command. I guess I have included everything.Isn't it related to the proportion of the coefficients in the model? I mean should each factor loading squared+the respective residual variance for each obesrved variable add up to 1?
 Bengt O. Muthen posted on Wednesday, July 02, 2014 - 10:20 am
They don't have to add up to 1. To be able to judge this better, you may want to send the output to support@statmodel.com with your license number.
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