Create a new data set which does not contain the Type variab

Create a new data set which does not contain the ”Type” variable. Find the best regression model for this new data set. [Hint: Now we can use PROC REG. (Again why?)] If you are interested, you can add the option ’SELECTION’. For details, make reference to the book on page 161. Following is the recommended code for this option. MODEL Mileage = Weight Disp Fuel/SELECTION = backward; /*forward, stepwise*/

Solution

For a best regression model, you want to include the variables that you are specifically testing along with other variables that affect the response in order to avoid biased results.

PROC REG is a useful way to identify outliers and determine other statistical information, but the output can be dense and difficult to interpret.