IRT Model: Estimating Group-level Abi... PreviousNext
Mplus Discussion > Latent Variable Mixture Modeling >
 Bob Houchens posted on Wednesday, September 03, 2008 - 4:47 pm
Can anyone refer me to an article or an example that explains how to specify and estimate group-level "ability" from two-level data?

My data consist of patient scores on 4 binary items (quality scores), and patients are nested within physicians. Each patient can respond to 1, 2, 3, or 4 items.

I want to estimate a parameter for each physician that estimates the latent quality for that physician.
 Bengt O. Muthen posted on Thursday, September 04, 2008 - 8:56 am
I don't know about an article off hand. Multilevel IRT would be a good Google term. In Mplus this is handled in line with UG ex 9.7 (simplified to having no covariates), where you can request estimation of factor scores for the group-level "fb" factor. The different numbers of items responded to is handled via missing data.
 Bob Houchens posted on Thursday, September 04, 2008 - 12:39 pm
Thanks. I'll look at ex. 9.7.
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