Plotting Item Characteristic Curves in Mplus

QuantFish instructor and statistical consultant Dr. Christian Geiser shows how to plot the item characteristic curves for item response theory (IRT) models in Mplus.
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[@profalamer_sem]

Question: why ML is used when the items are categorical? I see this in the literature as well but not clear why not using MLR

[@QuantFish]

It depends on whether you want regular (ML) or robust (MLR) standard errors. The parameter estimates are the same no matter whether you use ML or MLR.
Best, Christian Geiser

[@profalamer_sem]

@@QuantFish Thanks for the feedback. However, it is still unclear why ML is used for categorical data in IRT models (particlilry when items are binary)