Hi everybody, and sorry for my english ! I use the proc Calis to run confirmatory factor analysis, using the lineqs statement. Data contains categorical variables, representing answers (1, 2, 3 or 4) of some items of a scale. So, i want to analyze polychoric correlations with the WLS method, and not with the maximum likelihood one. The problem under SAS with proc calis, polychoric correlations and WLS estimation method, is the need of an asymptotic covariance matrix (in the INWGT option). The error on SAS is : "ERROR: You need either a DATA= raw data set or an INWGT= data set to compute WLS or DWLS estimators." How can i compute this asymptotic covariance matrix ? Thank you !
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