1. Download the CPS data from the IPUMS website. 

2. Give the downloaded data in STATA format the filename cps9416.dta.

3. Run the program create9416.do. 
This program imputes the "likely undocumented" identifier for each person.

4. The program creates a new data set called gbtype9416.dta,
which is the file containing the likely undocumented identifier.

5. Any analysis of the data must merge the cps9416.dta and the gbtype9416.dta files. 
The merging is done as follows:


use /volumes/ddisk/illegal/ipums/cps9416.dta, clear;

sort year serial pernum;

merge year serial pernum using /volumes/ddisk/illegal/newclass/gbtype9416.dta;
drop _merge;





