I'm currently working on the data which has 90% 0s in response variable. Based on my research, it seems zero inflated models could be a solution to this. However, while I was reading related documents, it seems the basic idea of two part model( hurdel) is
$ E[Y|X] = P(Y>0|X) E[Y|X,Y>0]$
The question is will it be okay if I use any model to get both
E[Y|X,Y>0] ,and multiply the result of those two?
More specifically, in R code would be like
#for first model FirstModel=randomforest(Y,X) #random forest First_pred=predict(FristModel,newdata,type='prob') #for second model SecondModel=glmnet(Y~X) #glm with L1 L2 penalty Second_pred=predict(SecondModel,newdata) #for E[Y|X] = P(Y>0|X) * E[Y|X,Y>0] First_pred * Second_pred
Will this make sense in view of machine learning modeling strategy? In other wards, will this improve accuracy of prediction without considering interpretation?