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Hello, 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 Philippe |
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You can use only this subject in an n=1 run, where you fix all the parameters. You request factor scores. |
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Thank you, I'll give it a try Philippe |
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