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Re: AMOS error: moment matrix is not positive definite

Posted by Frans Marcelissen-3 on Feb 28, 2012; 12:37pm
URL: http://spssx-discussion.165.s1.nabble.com/AMOS-error-moment-matrix-is-not-positive-definite-tp5520824p5521724.html

An illegal cov matrix can also be the result of pairwise deletion of missing values, especially
when the number of missings is high. I have the impression that this is the most frequent occurring reason.
Frans
 
> Date: Mon, 27 Feb 2012 20:45:55 -0800

> From: [hidden email]
> Subject: Re: AMOS error: moment matrix is not positive definite
> To: [hidden email]
>
> One or more of the stated reasons is probably correct!
> How many cases? How many variables? Have you googled Non-Positive Definite
> Matrix to learn what such a situation implies and what possible remedies may
> be applied. Perhaps consider attaching your moment matrix file to your next
> message and perhaps someone will take the time to look at it.
>
> ------
>
> Nabaneeta Saha wrote
> >
> > Hello,
> >
> > I am trying to run a path analysis with AMOS but I am getting the error
> > message:
> >
> > Minimization unsuccessful.
> >
> > The sample moment matrix is not positive definite. It could fail to be
> > positive definite for any of the following reasons:
> > 1. The sample covariance matrix or correlation matrix contains a data
> > entry error
> > 2. The observed variables are linearly dependent
> > 3. The sample covariance matrix was computed from incomplete data using
> > the method pairwise deletion
> > 4. The sample correlation matrix contains correlation coefficients
> > other than product moment correlations.
> >
> > The message tells me to allow non-positive values for the matrix, I did
> > so,
> > but still I am getting the error message
> >
> > Could anyone please let me know where am I going wrong. It would really be
> > of great help.
> >
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