I have split my data into two parts. I have used my 80% data to build a multiple regression linear model. Now I want to test it using my rest 20% data. What tools on Minitab do I have to make this checking process?
Edit: I think I can use PRESS statistic. My PRESS for 80% data was 6000 and now based on this model I have calculated the PRESS for 20% data, it is 1000. Now, should I compare 6000 with 1000 or 6000 with 5 times 1000, ie 5000?