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st: AW: First difference in multidimensional panel


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: First difference in multidimensional panel
Date   Fri, 24 Apr 2009 17:42:29 +0200

<> 


" when using tsset how do I create unique id for each  
industry-country pair"

I cannot see how this is related to -tsset-ing. -egen, group()- does the job
with or w/o it...

*************
clear*

input str10 Ind  str10 Cty year  
1 A 2000
1 B 2000
1 C 2000
1 A 2001
1 B 2001
1 C 2001
1 A 2002
2 A 2000
2 B 2000
2 D 2000
2X B 2001
2X A 2002
2X B 2002
end

gen intrafirmimports=rnormal(20000,2000)

compress

encode Cty, generate(country)
encode Ind, generate(industry)

list, noobs  

//get unique id for pairs
egen indcouID=group(industry country)
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von
mm3040@columbia.edu
Gesendet: Freitag, 24. April 2009 17:30
An: statalist@hsphsun2.harvard.edu
Betreff: st: First difference in multidimensional panel

Dear stata list members,

I have a panel data of share of intra-firm imports (s_{ict}) where  
observations vary over industry (i), country (c) and time (t). I need  
to calculate the first difference of s_{ict}:
Delta_s_{ict}=s_{ict}-s_{ic(t-1)}.
I am not sure how to do this since I do not have a unique panel variable.
Also when using tsset how do I create unique id for each  
industry-country pair (where both industry and country are string  
variables). Any help would be appreciated.

My data is of the following form: Industry(Ind) and Country (Cty) are  
both string variables
Ind Cty Yr
1 A 2000
1 B 2000
1 C 2000
1 A 2001
1 B 2001
1 C 2001
1 A 2002
2 A 2000
2 B 2000
2 D 2000
2X B 2001
2X A 2002
2X B 2002

Thanks in advance,
Best,
Modhura.

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