Thank you Steve. I will try your recommandations. But are you sure that the data that contains the OUTWGT output is the asymptotic covariance matrix ? Concerning the error, i use in the DATA= a polychoric correlation matrix, so the error is normal. The WLS analysis is possible when raw data is specified in DATA=, and it is also possible when a correlation matrix is specified in DATA=, but in this case the INWGT option is needed. Thank you.
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