full mirt equating

[somayeh Bahmanabadi]

Hi dear all

Can I run multidimensional IRT equating true score with mirt package?

[Phil Chalmers]

Yes. You would need to freely estimate the variance components and mean structure in the focal group using the multipleGroup() function, which would require at least D suitably selected anchor items (where D is the dimensionality of the model). 

 

Phil

On Sun, Sep 15, 2019 at 9:21 AM somayeh Bahmanabadi <s.bamna...@gmail.com> wrote:

Hi dear all

Can I run multidimensional IRT equating true score with mirt package?

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[somayeh Bahmanabadi]

Hi dear Phil 

thanks for your response.

my data design is equivalent groups, and I dont have any anchor test.

can I run FULL MIRT observe score equating with multipleGroup() function, too?

can you send me an guideline for FULL MIRT observe score equating, please. 

thank you

[Phil Chalmers]

The mirt package does not include observed score equating methods, you'll have to look elsewhere. Though note that using observed scores for equating is effectively the same as treating all the items as anchors, so the previously described approach would be just as valid in this setting. 

Phil

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