[Rasch] How to extend a CAT?

Felix Fischer felix.fischer at charite.de
Mon Sep 7 02:56:10 EST 2009

Hello everyone,

I plan to add new items to a existing CAT. The CAT and its itembank is
based on a GPCM. I think, the procedure should be something like:

1. check for unidimensionality (CAT and new items)
2. estimate IRT-model for new items
3. somehow connect CAT-model and model for new items

Can someone give me a hint about the procedure? Is there any literature,
where something like this was done or explained?

Thank you very much
Felix Fischer

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