Multiple group

[Caio Lucidius Naberezny Azevedo]

Hi all,

Where could a find a example about the fit of a multiple group model where the groups are not submitted to the same test?

Thank you very much,

Best,

Caio

[Phil Chalmers]

I'm not sure what you mean here. You have, say, two groups and there are no common items between the groups (i.e., all the individuals received unique test items in their respective group membership)? In that case, there's no point of using multiple group estimation because no linking can be done. Instead, just use separate single-group models. 

Phil

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[Caio Lucidius Naberezny Azevedo]

Hi Phil,

Sorry if was not clear. I am aware about this issue. I mean differnt tests with some structure of common items. E.g., 15 items exclusive of Test 1 (group 1), 10 items exclusive of Test 2 (group 2), besides 7 items shared by the two tests.

Many thanks,

Best,

Caio

Em quinta-feira, 14 de setembro de 2017 11:46:36 UTC-3, Phil Chalmers escreveu:

I'm not sure what you mean here. You have, say, two groups and there are no common items between the groups (i.e., all the individuals received unique test items in their respective group membership)? In that case, there's no point of using multiple group estimation because no linking can be done. Instead, just use separate single-group models. 

Phil

On Sat, Sep 9, 2017 at 7:39 PM, Caio Lucidius Naberezny Azevedo <cna...@gmail.com> wrote:

Hi all,

Where could a find a example about the fit of a multiple group model where the groups are not submitted to the same test?

Thank you very much,

Best,

Caio

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[Phil Chalmers]

I see. Perhaps this previous thread will help: https://groups.google.com/forum/#!searchin/mirt-package/multipleGroup$20constrain%7Csort:relevance/mirt-package/OM8Fy6D1HBw/x8tyjnsMBgAJ

Phil

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[Caio Lucidius Naberezny Azevedo]

Many thanks, Phil. I will take a look on this link that you suggested.

Best,

Caio