Dear Nick,
thanks. I can see how this creates a nice rectangular dataset. However, how could I get Stata to take the values of the x-variables over? At the moment, the "1-2" pair, for example, has 567 as value for the x-variable, but after fillin, the "2-1" pair, which now exists, is empty for the x-variable, but I'd like to have it as 567 as well. Any help greatly appreciated again.
Best, Eric
------------------------------
Date: Tue, 20 Apr 2004 14:18:13 +0100
From: "Nick Cox" <n.j.cox@durham.ac.uk>
Subject: st: RE: Resdesigning dyadic data formats
fillin c1 c2
replace x = . if _fillin
drop _fillin
Nick
n.j.cox@durham.ac.uk
Neumayer,E
> I have a "dyadic" dataset that looks like this (which is the
> traditional way of setting up such data):
>
> c1 c2 x
> 1 2 567
> 1 3 345
> 1 4 7
> 1 5 348
> 2 3 47
> 2 4 3
> 2 5 48
> 3 4 23424
> 3 5 347
> 4 5 234
>
> The "c1" and "c2" are identifiers for the two dyads. I would
> like to re-design the data to have it in the following format:
>
> c1 c2 x
> 1 1
> 1 2 567
> 1 3 345
> 1 4 7
> 1 5 348
> 2 1 567
> 2 2
> 2 3 47
> 2 4 3
> 2 5 48
> 3 1 345
> 3 2 47
> 3 3
> 3 4 23424
> 3 5 347
> 4 1 7
> 4 2 3
> 4 3 23424
> 4 4
> 4 5 234
> 5 1 348
> 5 2 48
> 5 3 347
> 5 4 234
> 5 5
>
> Note that now the identical pairs (1-1, 2-2, 3-3, 4-4, 5-5)
> have missing x-values, of course, and that all x-values exist
> twice now (e.g., once for 1-5, and once for 5-1). I know, one
> could do this redesigning by hand, but given that my actual
> dataset is far bigger, I am looking for a way to let Stata do
> the work for me. Any ideas?
>
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