use "C:\Users\Asus\Documents\AUCA\Teaching\2020-2021\Applied Econometrics\Seminars\Seminar 7\Data\htv.dta" 
regress educ motheduc fatheduc
regress educ motheduc fatheduc abil
use "C:\Users\Asus\Documents\AUCA\Teaching\2020-2021\Applied Econometrics\Seminars\Seminar 7\Data\wage2.dta"
regress lwage educ exper tenure married south urban black
regress lwage educ exper tenure married south urban black IQ