st: foreach or forvalues to re-structure data

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

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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