Use value label in if command

Question

I am working with a set of dta files representing surveys from different years.

Conveniently, each year uses different values for the country

Answer 1

To complement @Dimitriy's answer:

clear all
set more off

sysuse auto
keep foreign weight

describe foreign
label list origin

replace weight = . if foreign == 0

list in 1/15
list in 1/15, nolabel 

describe displays the value label associated with a variable. label list can show the content of a particular value label.