Goodafternoon,
I amcurrently in the process of calibrating an item bank using a GPCM model.
So, amI right to assume that the bifactor model allows me to work with my
generalfactor by assimilating it to a one-factor model, without taking into
account groupfactors? That is, I can estimate my item parameters from my factor
loadings onthe general factor only?
If so, Ihave some questions about evaluating the fit of my model. The
calculation of infitstatistics is specific to unidimensional models. Can I
compute infit statisticsusing the general factor or do I have to do this
separately for each of the groupfactors? Or is there a more appropriate method
to evaluate the fit of my modelwhen calibration an item bank using a GPCM model?
Thank youin advance.
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