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| From | brendan.halpin@ul.ie (Brendan Halpin) |
| To | statalist@hsphsun2.harvard.edu |
| 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 mailto:brendan.halpin@ul.ie ULSociology on Facebook: http://on.fb.me/fjIK9t http://teaching.sociology.ul.ie/bhalpin/wordpress twitter:@ULSociology * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/