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Sywang posted on Friday, July 20, 2012 - 3:38 pm
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Hi, 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?)? |
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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. |
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Sywang posted on Friday, July 20, 2012 - 11:38 pm
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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? |
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WLSMV provides chi-square and related fit indices. Regarding Delta and Theta, see page 535 of the user's guide. |
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Sywang posted on Saturday, July 21, 2012 - 12:35 pm
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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? |
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Look at modification indices. See the MODINDICES option. |
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Sywang posted on Sunday, July 22, 2012 - 11:10 am
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Thank you! |
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