3pl-MIRT(within-item)

[Can Yang]

Hi there,

Can this package deal with 3pl-MIRT(within-item especially)？I have read the manual but haven't been able to find details or examples about it.It seems that papers only introduce how to deal with between-item MIRT and Bfactor model etc.

Thanks.

[Phil Chalmers]

Yes, just specify your model using the mirt.model() syntax. See the associated help file for details, and use the itemtype = '3PL' for each item you want modelled as a 3PL. 

Phil

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