Calculating residuals from regression
Your previous model that predicts the log of sales from the log of price along with holiday and promotion effects is saved in the model_MET_hi_full
object. Your data frame that has the data that built this model is in the object MET_hi_train
. Now let's see where we went wrong.
This exercise is part of the course
Forecasting Product Demand in R
Exercise instructions
- Calculate the residuals from the model
model_MET_hi_full
and save asMET_hi_full_res
. - Convert these residuals into an
xts
object. Remember your date index is stored asdates_train
.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Calculate the residuals from the model
MET_hi_full_res <- ___(___)
# Convert the residuals to an xts object
MET_hi_full_res <- xts(___, order.by = ___)