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RE: st: Build groups with the same first two numbers of SIC


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Build groups with the same first two numbers of SIC
Date   Fri, 20 Mar 2009 11:22:56 -0000

There's some minor confusion here. I didn't recommend fixing your loop with -capture-, as there is no need to write a loop in the first place. 

More specifically, it's not a case of anybody's preference for return codes. The return codes to work with are those that a command might return. In many cases, the return code is 0 if something works and some non-zero code if it doesn't, and the programmer can work on that basis. 

Nick 
n.j.cox@durham.ac.uk 

Hua Pan

Thank you very much for your help. 

Michael, your command is great, very effective. That’s exactly what I want and failed to find. Thank you indeed.

Martin and Nick, Thank you for your suggestions. After I added “capture” before “by”, the loop continued to work, and I also got the daily mean return for all firms with this complicate method. After I typed, 
-di in red _rc-
the return code was 198. Does that mean that this code is wrong? Error (198)
When I put “capture” before “by” and “save”, the loop also continued to work and I got what I want, but this time the return code was zero. 
“Capture” is really useful, that can help me a lot later, so I want to know why there are different return codes and which one should I prefer? Thanks a lot in advance.


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