I am helping examine differential item functioning between men and women on a number of categorical indicators. I had been planning on using the grouping option to specify multiple groups, however, when I do this, the program halts and requests that I use the knownclass option. I have 2 points that I want to clarify:
1) If I change the estimator to WLSMV and run the model under those assumptions, the results of the DIF analyses would be interpretable ftom the difftest command, right?
2) If I use the knownclass command, I would specify:
classes are sex (2) c (2); knownclass is sex (1=male 2=female);
and then run the analysis with an overall model and class specific models to test DIF. Is that correct?
Stata posted on Thursday, October 04, 2012 - 8:13 pm
I am interested in conducting 1) differential item functioning with IRT, logistic regression, and Mantel-Haenszel. I haven't found any examples (syntax) in Mplus website regarding how these DIF methods are used with Mplus. Is it possible to conduct these analysis with Mplus? I hope it is possible.
2)The dataset which will be used for the analysis is a national dataset. In this case, is it necessary to incorporate sampling weight in DIF analysis?
IRT DIF can be investigated in Mplus using the MIMIC (factor analysis with covariates) approach or the multiple-group approach. Please see the Topic 1-2 handouts and videos on our web site. You can use ML, WLSMV, or Bayes estimation.