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 Sywang posted on Friday, July 20, 2012 - 3:38 pm

I'm running a Rasch model.How do I get the Theta score (person's ability)? And, how do I interpret the model fit for Rasch (fit index?)?
 Bengt O. Muthen posted on Friday, July 20, 2012 - 8:55 pm
A person's ability is obtained by requesting factor score estimation - see the UG.

Mplus does not provide the usual Rasch model fit indices. But if you use WLSMV you get a factor analysis oriented test of model fit.
 Sywang posted on Friday, July 20, 2012 - 11:38 pm
Thank you for your reply!
I did use WLSMV, so which fix index should I look at? The same as regular factor analysis?
Also, I know there is two parameterizations, Delta and Theta. What's the differences between these two?
 Linda K. Muthen posted on Saturday, July 21, 2012 - 5:57 am
WLSMV provides chi-square and related fit indices.

Regarding Delta and Theta, see page 535 of the user's guide.
 Sywang posted on Saturday, July 21, 2012 - 12:35 pm
Thank you!
My fit index doesn't look very good.
If i want to improve my model fit for Rasch, which part of the output should I look at?
 Linda K. Muthen posted on Sunday, July 22, 2012 - 10:48 am
Look at modification indices. See the MODINDICES option.
 Sywang posted on Sunday, July 22, 2012 - 11:10 am
Thank you!
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