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st: RE: Just another data reshaping problem


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Just another data reshaping problem
Date   Fri, 22 Apr 2005 15:31:59 +0100

Looks like 

gen id = 1 
reshape long group_ ID_g , i(id) 

and then a -contract-. 

There's really no substitute for detailed study 
of [R] reshape. The FAQ at

http://www.stata.com/support/faqs/data/reshape3.html

may also help. 

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

Sascha Robert

> Complex data reshaping unfortunately seems to lie beyond my logical 
> capabilities... so anyone up to a little brain-teaser?
> 
> My data (simplified) looks like this:
> 
> time    group_1 ID_g1      group_2    ID_g2
> 1       0       1          1          2
> 1       0       1          1          3
> 1       0       2          1          1
> 1       1       1          0          1
> 2...
> and so on.
> 
> The data says something like (for the first row:) At time 1, ID 1 of 
> group 0 encountered ID 2 of group 2. Note that an encounter always 
> involves two entities of two different groups.
> 
> I would like to reshape the data to the form:
> 
> group    ID    num_encounters(*)
> 0        1     x
> 0        2     y
> 1        1     z
> ...
> 
> (*)sum of ALL dyadic encounters where ID participated

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