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Re: st: RE: How can I find the sum of specific values of a variable?


From   Matt Dobra <mdobra@gmu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: How can I find the sum of specific values of a variable?
Date   Thu, 20 Nov 2003 18:06:29 -0500

I think abbrev only works for string variables, which might be a problem if sic is numeric.

A similar approach might be:

gen sicabbrev=round(sic-50,100)/100

and from there, do what Adrian suggests
 
de la Garza, Adrian wrote:
Why don't you use -abbrev(SIC,2)-? This will abbreviate the values of
SIC to only the first 2 characters. You can do this:

generate SICabbrev = abbrev(SIC,2)

Then you can store the value of all EXPs with SICabbrev = 20 in a
variable called 'sum' like this:

egen sum = sum(EXP) if SICabbrev == 20

Or you can get the sums by SICabbrev and collapse the dataset like this:

collapse (sum) EXP, by(SICabbrev)

Hope this helps.
Adrian


  
-----Original Message-----
From: Delis, A. [mailto:ad104@leicester.ac.uk] 
Sent: Thursday, November 20, 2003 4:39 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: How can I find the sum of specific values of a variable?


Dear Statalisters

I have a dataset like the following, where the SIC values are 
in an ascending order
SIC	EXP
2011	667.8039
2013	130.8002
.
.
.
.

2095	38.90306
2098	0.617763
2111	249.92
2121	3.738577
2131	35.32281
.
.
.
2298	5.709858
2299	39.7519
.
.
etc

What I want to find is the sum of EXP values that have a SIC 
value begining with 20, i.e. 667.8039+130.8002+..+38.90306+0.617763 
In others words I have some 4digit SIC data and I want to 
aggregate them into  2digit SIC.

Any hint is really appreciated

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