Re: st: foreach or forvalues to re-structure data

["Saleheen, Jumana" <Jumana.Saleheen@bankofengland.co.uk>]

Hi Jo,

Thanks for this suggestion - it does look more efficient.  Only problem is that I don't seem to have the 3Dmin command on my stata (I have stata12).

Is that a stata13 command?  Or can - download it?  

If not, is there another command I can use ?

Thanks
Jumana 


----- Original Message -----
From: Joe Howard [mailto:joehow@umich.edu]
Sent: Tuesday, November 12, 2013 11:04 PM
To: statalist <statalist@hsphsun2.harvard.edu>
Subject: Re: st: foreach or forvalues to re-structure data

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Try using collapse instead -- it's more efficient...

gen minid=3Dmin(country, partner)
gen maxid=3Dmax(country, partner)
drop country partner
collapse (sum) trade, by(minid maxid)

On Tue, Nov 12, 2013 at 5:24 PM, Saleheen, Jumana
<Jumana.Saleheen@bankofengland.co.uk> wrote:
> Hi,
>
> I’d like to use the commands foreach or forvalues to re-structure my dataset. Happy to use other commands if they work better.
>
> What I have is a dataset that  looks like this:  country 1 trades with country 2 and 3, but not with itself
>
> country       partner           trade
> 1              1              0
> 1              2              20
> 1              3              30
> 2              1              10
> 2              2              0
> 2              3              30
> 3              1              20
> 3              2              10
> 3              3              0
>
> And I want to transform the data to look like this:
>
> Rowcol  sumvar
> 12,21    30
> 13,31    50
> 23,32    40
>
> What I want is the pair-wise trading between two countries.
>
> So, in the end the number of observations I have should be much smaller, and equal to the pairs of countries in my data set.  In the above example, it would be 3.
>
> Thanks
> Jumana
>
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-- 
_______________________________________________
Joe Howard                                                     [in] LinkedIn
Doctoral Student
Center for the Study of Higher and Postsecondary Education
University of Michigan

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