How to identify whether a CUSIP is historical or header in the table “Companies2005” of GMI ratings in wrds?
Posted: 13 January 2016 06:54 AM   [ Ignore ]
Newbie
Rank
Total Posts:  3
Joined  2016-01-13

I just download some tables like companiesXXXX from year 2001 to year 2014. The identification is CUSIP and I need to merge it with Compustat. The first thing I come up with is to merge it to CRSP through CUSIP. But the problem is how to identify the CUSIP is historical or header. Could you help me with the problem?

Thanks a lot!

Grace

Profile
 
 
Posted: 13 January 2016 08:14 AM   [ Ignore ]   [ # 1 ]
Administrator
Avatar
RankRankRankRank
Total Posts:  901
Joined  2011-09-19

hi Grace,

It is often not clear if an identifier is historical or header. I usually check if for a given firm it changes over time (it won’t if it is header).

Best Regards,

Joost

 Signature 

To reply/post new questions: Please use the group WRDS/SAS on Google Groups! http://groups.google.com/d/forum/wrdssas

Profile
 
 
Posted: 14 January 2016 10:52 PM   [ Ignore ]   [ # 2 ]
Newbie
Rank
Total Posts:  3
Joined  2016-01-13

hi Joost,

Thanks for your help!

Grace

Profile
 
 
   
 
 
‹‹ RDATE and fiscal year      US Aggregate data ››