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st: need help to perform SEM for observed continuous and categorical data


From   nadiahassan <goldieash2000@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: need help to perform SEM for observed continuous and categorical data
Date   Sat, 8 Jun 2013 12:59:10 -0700 (PDT)

Hi, 
I am working on SEM model that has more than50 observed variables. these
include continuous observed variables for dependent variable whereas,
continuous, dichotomous and categorical observed variables for independent
latent variables.
I read on statlist archives to use polychoric command for performing sem on
categorical data. I have installed the command. 

My questions are:
Q1: Do I have to use this command for all 50 vars at a tiem? I tried it but
result window displays 
" could not calculate numerical derivatives
missing values encountered"
Q2: If i estimate polychoric matrix how can i do sem on this info?
 
Regards



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