Nonlinearity of Interaction Terms

[Fredie Didier]

Hello, good afternoon.

Consider I have the model below:

reg Y A B A*B, where Y (dependent variable) and A and B are all continuous variables. A*B is the Interaction term

I now want to check if the interaction term is nonlinear. How can I do this in stata using recent methods of the econometrics literature? I am having a hard time finding recent references for regressions like this.

Thanks

[Felix Bittmann]

One approach is presented here: https://www.statalist.org/forums/for...402#post152440