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| Invariance of item group models |
 
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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;
TYPE = CROSS;
%WITHIN%
%BETWEEN person%
y;
%BETWEEN item%
y;
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? |
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| Could you use dummy covariates to represent group? |
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