I am trying to create a semiparametric model for university (we were told it HAS to be semiparametric) and I have 11 response variables, some of them categorical and the rest continuous. In the simple glm case I could easily decide which variables to include with a stepAIC function in R, but now I not only have to decide which of them to include, but which should be part of the nonparametric component and which to the parametric one and I can not find any way to make the decission.
Is there a good way to approach this or to gain some intuition?
Thank you very much