Invariance of item group models PreviousNext
Mplus Discussion > Categorical Data Modeling >
 Stephan Daus posted on Monday, May 28, 2018 - 8:31 am
I am struggling to figure out how to extend DIF analysis at item level to the item group (item family or item cluster) level using Mplus.
1. With data in wide format I cannot indicate which items (columns) belong to which item group, so MIMIC with modindices seems inapplicable.
2. With data in long format, and these options I can set up a random 1PL model:
USEVARIABLES = person item y itemtype;
CLUSTER = person item;
CATEGORICAL = y itemtype;

%BETWEEN person%
%BETWEEN item%
But as multigroup is not possible with crossclassified, I wouldn't know how to compare item groups.
If these types of analyses are indeed not possible, do you have any plans on implementing it within a year's time?
 Bengt O. Muthen posted on Monday, May 28, 2018 - 5:40 pm
Could you use dummy covariates to represent group?
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