1PL model for Comp. and Partial Comp.

[Levent Yakar]

Hi Phil,

Can we estimate with 1PL for comp. and  partial comp. models? There is Rasch option for comp. model but my a index not equal 1. What do you suggest?

Best,

Levent.

[Phil Chalmers]

Rasch models can be achieved either by fixing all the slopes to a constant (1) and freely estimating the latent mean or by constraining all the slope parameters to be equal and fixing the latent means to a constant (1). So I would do the latter using the mirt.model syntax CONSTRAIN argument (set the compensatory items as 2PL's). 

Phil

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