The columns competition distance, competitionOpenSince , Promo2Since columns have NA's.
1.Promo2SinceWeek/Year is missing only for stores that did not run the promotion(Promo2=0).
2.Competition related columns are missing in random.
All these columns are specific to a store. Different stores will have different values. replacing a missing value by taking the mean/median of all other stores does not make sense to me.
I want to fit a linear regression/ regression trees model to predict sales. I really need some expert suggestions/ideas to handle these NA's with the appropriate method.
If required, I am ready to add the dataset here