| Date: | Wed, 3 Apr 2002 22:30:42 +0100 |
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| Reply-To: | "R. Allan Reese" <R.A.Reese@gri.hull.ac.uk> |
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| Sender: | "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU> |
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| From: | "R. Allan Reese" <R.A.Reese@gri.hull.ac.uk> |
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| Subject: | Re: Duplicate question |
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| In-Reply-To: | <3CAB6655.1EFA1FC1@fibertel.com.ar> |
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| Content-Type: | TEXT/PLAIN; charset=US-ASCII |
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Just to add a grace note to Hector's response, it is sensible to SORT thecases as a duplicate ID is possibly a mistyping so will be in the wrong
order. I have just used such an idea to add jitter to make colocated
points visible on a scatterplot. Only the "duplicate" points need be
moved:
sort cases by x y.
compute dup= (x eq lag(x)) and (y eq lag(y)).
compute jit= uniform(1)-0.5.
compute xj= x + dup*jit.
compute yj= y - dup*jit.
(BTW: I didn't paste this syntax, so apologies for any typos.)
R. Allan Reese Email: r.a.reese@gri.hull.ac.uk
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