use /assets/courses/ME104/hiedata_short.dta regress ghi sex age tinc weightkg diastol i.cig test (2.cig=0) (3.cig=0) reg ghi sex age tinc weightkg i.cig test (2.cig=0) (3.cig=0) reg ghi age tinc weightkg i.cig test (2.cig=0) (3.cig=0) reg ghi age tinc weightkg i.cig diastol test (2.cig=0) (3.cig=0)