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datarobot
2009 Apr 07
0
HELP: Use predict for Tobit Model. How to predict values in Tobit Model???
...am working on a Tobit Model for a consumer good, left censored with zero.
Relation: Sales of product depend on price, promotion (dummy), Season(dummy)
and store (dummy)
Used standard Tobitmodel with package(AER) vor a 48 week period:
tobitmodel<-tobit(SALE~Price+Promotion+Season+Store,data= datatobit)
Now I want to predict the values for week 49-52.
Used predict device:
pred<-predict(tobitmodel, newdata=datatobitnew)
I receive negative predicted values for Y! That does not make any sense??
Do I use the device wrong? Is there another way to predict Sales for new
data?
Thank you very muc...