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st: RE: Creating aggregated new observations


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Creating aggregated new observations
Date   Fri, 14 Jul 2006 09:54:33 +0100

Frankly, what you ask for is a bad idea. 

You want subtotals, but stored in extra observations. 

This can be done, but you will then need
to exclude such observations from most
calculations down the line. 

I suspect that you are thinking spreadsheet-style, 
but Stata is not a spreadsheet. 

What I suggest is something more like 

gen rounded_code = 20 * floor(code/20) 
bysort rounded_code : egen total_output = total(output) 
egen tag = tag(rounded_code) 
l rounded_code total_output if tag 

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

Woong.Chung@colorado.edu

> aggregate new observations.
> 
>  Suppose  I have a set of observations as follows
> 
>   code         year          output
>   2011        1981           2
>   2013        1981           3
>   2021        1981           4
>   2022        1981           2
>   2023        1981           3
>    .
>    .
>  2011         1982           1
>  2013         1982           2
>  2021         1982           3
>  2022         1982           4
> 
> 
>     What I like to do is create aggregated new observations 
> like this :
> 
>  code        year         output
>  2000        1981         15  - new added obs (2+3+4+2+3)
>  2011        1981          2
>  2013        1981          3
>  2020        1981          9    -new added obs (4+2+3)
>  2021        1981          4
>  2022        1981          2
>  2023        1981          3
>    ..
>   ..
> 2000        1982          10  -new added obs(1+2+3+4)
> 2011        1982           1
> 2013        1982           2
> 2020        1982           7  -new added obs (3+4)
> 2021        1982           3
> 2022        1982           4
> 
> 
> How do I add these outputs of both code 2000 (sum of all 5 
> observations) and
> code 2020 ( sum of  2021 ,2022), respectively.

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