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Re: st: Adjacency matrix in Stata
From
Stas Kolenikov <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Adjacency matrix in Stata
Date
Sun, 30 Mar 2014 12:34:14 -0500
It would be cumbersome whichever way you want to look at it. And at
any rate Stata won't be able to store a 100K x 100K matrix... only 11K
x 11K matrices (see -help limits- and -set matsize-).
-- Stas Kolenikov, PhD, PStat (ASA, SSC)
-- Principal Survey Scientist, Abt SRBI
-- Opinions stated in this email are mine only, and do not reflect the
position of my employer
-- http://stas.kolenikov.name
On Sun, Mar 30, 2014 at 11:55 AM, jean-luc morin-chesnel
<[email protected]> wrote:
> Dear all,
>
> I have a panel dataset at the individual - day - product level
> (unbalanced) and I would like to obtain a adjacency matrix in Stata,
> but I do not know how to proceed.
>
> That is, I assume that 2 individuals are connected in the network if
> they buy the same product the same day more than N times in my dataset
> (lets say N=10).
>
> So I would like to obtain a matrix of adjacency in Stata: a MxM matrix
> (M in the number of investors) where the coefficient mij=1 iff
> investor i and investor j are connected in the network.
>
> I do not know how to proceed because I think that I should use loops,
> but it seems to me that it is not very efficient to do so in Stata
> (the dataset is large: 100k individuals). Any suggestion is very
> welcomed.
>
> Many thanks,
> Regards,
>
> JL
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