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Ali posted on Tuesday, April 08, 2014 - 8:17 am
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According to the report "IRT in Mplus" (Nov 14th, 2013), Logit/Probit Link, ML/ULS Estimators can be used for IRT modeling. However, I tried to use ML and ULS for a binary data set, and these two estimators doesn't work. The ML and ULS estimation cannot be applied to binary data, is it correct? Here is a sample of my syntax: DATA: file is dat1.txt; VARIABLE: names are x1-x22; !categorical are x1-x22; ANALYSIS: estimator=ml; !estimator=uls; parameterization=theta logit; !link=logit; Model: Y by x1-x22*; Y@1; SAVEDATA: RESULTS ARE results.dat; Second question: How can I save the IRT item discrimination and difficulty estimates and their SE to a txt file? The SAVEDATA function only saves the factor loadings and thresholds. Is there a way to save the IRT item parameters? |
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Both ULSMV and ML are available with categorical outcomes. I'm not sure why you think they are not available. The IRT item parameters cannot be saved. |
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