1. 连续变量

. gen dage = age

. replace dage=1 if age>=20 & age<=29

. replace dage=2 if age>=30 & age<=34

. replace dage=3 if age>=35 & age<=39

. replace dage=4 if age>=40 & age<=44

. replace dage=5 if age>=45 & age<=49

. replace dage=6 if age>=50 & age<=54

. replace dage=7 if age>=55 & age<=59

. replace dage=8 if age>=60 & age<=69

2. ordinal variable

tabulate RACE, gen (RACE_)