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AHYOUNG posted on Wednesday, October 14, 2015 - 1:55 pm
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I'm running a second order model but getting this warning message: THE LATENT VARIABLE COVARIANCE MATRIX (PSI) IS NOT POSITIVE DEFINITE...PROBLEM INVOLVING VARIABLE F1. The model is this: c@1; f1 BY u1-u12; f2 BY u13-u28; f3 BY u29-u42; f4 BY u43-u50; f5 BY u51-u53; c BY f1* f2-f5; I see that the residual for F1 is negative and the estimated correlation between c and f1 is over 1. The problem was solved when I fixed the residual for f1 as 0 by adding "f1@0;"in the code. But I would like to know if there is any other way to solve the problem besides this. Thanks for your help in advance! |
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One reason this happens could be that the simple CFA structure (zero cross-loadings) for the first-order factors may cause too high first-order factor correlations. |
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Alice posted on Wednesday, October 14, 2015 - 3:33 pm
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Dear Bengt O. Muthen, Will it be possible to suggest an example code that can be added to the above model that might help solve the problem? |
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Use Modindices to check if there are some cross-loadings or residual covariances among indicators that need to be added. |
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Alice posted on Wednesday, October 14, 2015 - 6:47 pm
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Thank you very much! |
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