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


From   "Delis, A." <ad104@leicester.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: How can I find the sum of specific values of a variable?
Date   Thu, 20 Nov 2003 21:39:25 -0000

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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