Exercise

What about price?

Stop! You forgot to incorporate the effect of temporary PRICE changes in your model. You can correct this mistake by using the function update(). The update() function re-fits the dummy response model by updating and evaluating the log(SALES) ~ DISPLAY + COUPON + DISPLAYCOUPON relation stored in the dummy.model object.

Instructions

100 XP

Update the dummy.model object for PRICE by using the update() function.