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

 From "de la Garza, Adrian" To Subject st: RE: How can I find the sum of specific values of a variable? Date Thu, 20 Nov 2003 17:38:01 -0500

```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.

> -----Original Message-----
> 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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>

*
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```