Theta error IRT PreviousNext
Mplus Discussion > Categorical Data Modeling >
 Valeria Moran posted on Tuesday, February 20, 2018 - 10:00 am
Hi, I want to know how to save the error of theta for each person in a multidimensional model with IRT analysis.
Also, how to obtain the factor scores and their error in a second sample, taking into account the parameters estimated with a original sample.
Thank you!
 Bengt O. Muthen posted on Tuesday, February 20, 2018 - 2:02 pm
Check the UG for FScores which can be saved using the Savedata command. Different estimators give different savings.
 Bengt O. Muthen posted on Tuesday, February 20, 2018 - 2:03 pm
For the second part of your question, in your second sample you should fix all parameters at the estimated values from the first sample and just estimated the Fscores.
 Valeria Moran posted on Thursday, February 22, 2018 - 12:49 pm
Iīve tried your suggestion, but the results show the same error for all the sample, it couldnīt be possible, I think...
What do you think could be the cause? the estimator maybe?
 Bengt O. Muthen posted on Thursday, February 22, 2018 - 3:23 pm
Send the output and data to Support along with your license number so we can look at what's going on.
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