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Mplus Discussion > Confirmatory Factor Analysis >
 Philippe Golay posted on Tuesday, March 27, 2012 - 1:53 am

I just wanted to know if it was possible to get IRT scores estimates for a single subject starting from a previously estimated IRT model.

Imagine that an IRT model is fitted on a standardization sample in order to estimate the items parameters. Then someone answer the previously calibrated test. Can we use the responses pattern of this person and estimate a single individual score through the known item parameters ? Should we add the data of this individual to the sample and re-estimate the model (but the item parameters may slightly change) or is there an easiest way to do that ?

Many thanks

 Bengt O. Muthen posted on Tuesday, March 27, 2012 - 9:27 am
You can use only this subject in an n=1 run, where you fix all the parameters. You request factor scores.
 Philippe Golay posted on Wednesday, March 28, 2012 - 4:46 am
Thank you, I'll give it a try

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