4
$\begingroup$

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 P(Y>0|X) and 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?

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.