Re: about MIRT package

[Phil Chalmers]

On Tue, Feb 28, 2017 at 3:31 PM, serap büyükkıdık <sbuyu...@gmail.com> wrote:

Dear Chalmers,

I want to compare multi-unidimensional/simple structure/between item polytomous IRT model. You mentioned in MIRT description: Analysis of dichotomous and polytomous response data using unidimensional and multidimensional latent trait models under the Item Response Theory paradigm. Can I use MIRT package for multi-unidimensional polytomous IRT model? Which code I must use for estimating item and person parameters in multi-unidimensional Graded response and partial credit model? Can you give me examples?

See the mirt.model() function for examples of how to specify these types of models. I'm sure there's a number in the package documentation as well, just check the help files. 

 

In simdata codes, can we generate multidimensional polytomous response patterns from real data?

Yes. At least I think yes; I'm not 100% sure I understand the question. You can generate response patterns from a model, which look like they are real data.

 

Thank you for reading my mail. I'm waiting your response.

Best.

Serap

PS. Multi-unidimensional model is special case of multidimensional model. You can see below.

(Multi-unidimensional/simple structure/ between item multidimensional model is in the right)

Complex structure/ within item multidimensional model is in the left)

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Kalın sağlıcakla.
Serap BÜYÜKKIDIK