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f f posted on Tuesday, June 03, 2014 - 7:56 pm
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Hello, I am testing a SEM with 2 DVs, 2 mediators, and 8 IVs composed of 59 categorical observed variables. I receive the error below: WARNING: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) 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 WSAT." I've checked TECH4 and the residual is WSAT=-0.123. WSAT is one of DVs. What should I do to solve this problem? Thank you in advance. Farveh |
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This message means the model is inadmissible and needs to be changed. I would not fix a residual variance that large to zero. |
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f f posted on Wednesday, June 04, 2014 - 6:51 pm
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Thank you very much. |
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