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Re: st: (st) Automatical aggregation from 4 digit codes to 3,2 digit codes?


From   "woongtae" <Woong.Chung@colorado.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: (st) Automatical aggregation from 4 digit codes to 3,2 digit codes?
Date   Fri, 24 Nov 2006 14:48:06 +0900

Thanks. It works.
WT 
----- Original Message ----- 
From: "Philipp Rehm" <Philipp.Rehm@gmx.de>
To: <statalist@hsphsun2.harvard.edu>
Sent: Thursday, November 23, 2006 6:33 PM
Subject: Re: st: (st) Automatical aggregation from 4 digit codes to 3,2 digit codes?


> This may work:
> 
> * inputting your example data:
> clear
> input  ID   year   var1
>   1111   72    2
>   1112   72    1
>   1113   72    4
>   1121   72    3
>   1111   73     1
>   1112   73     2
>   1113   73     3
>   1121   72     4
> end
> 
> * doing the trick:
> foreach N in 3 2 {
>    preserve
>    gen ID_`N'd=real(substr(string(ID),1,`N'))
>    collapse (sum) var1, by(ID_`N'd year)
>    rename ID_`N' ID
>    tempfile temp_`N'
>    save `temp_`N'', replace
>    restore
> }
> 
> foreach N in 3 2 {
> append using `temp_`N''
> }
> 
> sort year ID
> list
> 
>       +--------------------+
>       |   ID   year   var1 |
>       |--------------------|
>    1. |   11     72     14 |
>    2. |  111     72      7 |
>    3. |  112     72      7 |
>    4. | 1111     72      2 |
>    5. | 1112     72      1 |
>       |--------------------|
>    6. | 1113     72      4 |
>    7. | 1121     72      4 |
>    8. | 1121     72      3 |
>    9. |   11     73      6 |
>   10. |  111     73      6 |
>       |--------------------|
>   11. | 1111     73      1 |
>   12. | 1112     73      2 |
>   13. | 1113     73      3 |
>       +--------------------+
> 
> 
> Just a few things:
> - The basic trick I use it to -collapse- the data-set, and then to 
> append it.
> - Note that the -append-s have to stay outside the loop.
> - Quite often, one wants to specify weights in a collapse. That's easy 
> to add.
> - If you want the 1-digit aggregates as well, just add a "1" into both 
> -foreach- loops.
> 
> HTH,
> Philipp
> 
> 
> 
> 
> Woong.Chung@colorado.edu wrote:
> > Hello. Stata Users.
> > I need your help.
> > I have panel set containing ID(4 digit), year and Var1, for simple case.
> > I just want to add 2 or 3 digit level Var1 using aggregating up 4-digit level
> > coded. For example, Currently my dataset looks like (from sort by year id)
> > 
> >  ID   year   var1
> >  1111   72    2
> >  1112   72    1
> >  1113   72    4
> >  1121   72    3
> >    .     .    .
> >   ..     ..   ..
> > 
> >  1111   73     1
> >  1112   73     2
> >  1113   73     3
> >  1121   72     4
> > 
> > 
> >  I would like to add var1 as follows:
> > 
> >  ID     year     var1
> >  11     72     ???(7+??+....)
> >  111    72     7 (2+1+3)
> >  1111   72     2
> >  1112   72     1
> >  1113   72     4
> >  112    72     ?? (3+?+?...)
> >  1121   72     3
> >    .     .    .
> >   ..     ..   ..
> >  11     73     ?? (6+?)
> >  111    73     6 (1+2+3)
> >  1111   73     1
> >  1112   73     2
> >  1113   73     3
> >  112    73     ? (4+..)
> >  1121   72     4
> > 
> > 
> > As you see, the aggregating values should be added by year and ID.
> > Since I have lot of codes, it would take forever to generate each 3 and 2 digit
> > level manually. It is possible way to create automatically 3 and 2 digit level
> > code and following new var1 in the system?
> > Thanks. Any comments and helpful remarks should be appreciated
> > WT
> > 
> > 
> > 
> > 
> > 
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> > 
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