(* PS5.5, using DATA4-6 for the second application in Section 5.4 *)
corr urb famsize unemp highschl college medinc
(* Model A -- most general specification *)
ols povrate const urb famsize unemp highschl college medinc
(* Model B -- omit unemp with the highest p-value *)
omit unemp
(* Model C after omitting urb *)
omit urb
(* Model D -- exclude medinc *)
omit medinc
(* Relate medinc to its determinants and confirm multicollinearity *)
ols medinc 0 famsize unemp highschl college
