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Re: st: Preventing double counting
From
[email protected] (Brendan Halpin)
To
[email protected]
Subject
Re: st: Preventing double counting
Date
Wed, 07 Dec 2011 23:47:37 +0000
On Wed, Dec 07 2011, Michael Betz wrote:
> Does anyone have any
> suggestions about how I could get rid of the second observation that
> gives me the negative net migration of the first observation?
If the data is consistent and full (all pairs in the data), then
keep if orig_state < dest_state
will throw away the redundant half (and the uninformative diagonal).
My instinct, however, would be to test the assumptions of consistency
(i.e. Mij = - Mji) and the presence of all pairs. A simple test would be
to repeat the exercise with
keep if orig_state > dest_state
and checking that you get identical data (with the sign reversed).
Brendan
--
Brendan Halpin, Department of Sociology, University of Limerick, Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F1-009 x 3147
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