st: -inteff- with categorical dummies?

[Andrea Bennett <mac.stata@gmail.com>]

Dear all,

I know there exists the -inteff- command which allows to generate nice  
graphs for interaction effects in non-linear estimations. However, it  
seems that one cannot use -inteff- to deal with categorical dummies,  
i.e. four levels of education (each as a dummy) interacted with gender.

So, how could one perform something similar to the graphs generated by  
-inteff- which takes the categorical aspects of the interaction into  
account?

Kind regards and many thanks for your consideration,

Andrea
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