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Re: st: Ranking observations within groups


From   David Airey <david.airey@Vanderbilt.Edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Ranking observations within groups
Date   Thu, 11 Dec 2008 09:36:35 -0600

Seems the unique option does what you describe you need.

clear
webuse machine.dta
drop operator
bysort machine: egen rank = rank(output)
bysort machine: egen rankf = rank(output), field
bysort machine: egen rankt = rank(output), track
bysort machine: egen ranku = rank(output), unique
sort machine output
list, clean



On Dec 11, 2008, at 9:04 AM, James Cross wrote:

Hi Statalisters,

I have a variable that represents different actors positions on
different issues (groups). So I have around 30 positions between 0 and
100 for each individual issue within the variable with quite a few
ties. I want to create a variable that ranks these observations in
ascending order so that the lowest observation(s) will have a value of
1 in the new variable, the second lowest observation(s) will have a
value of 2 and so on.

I have tried -by issue_var: egen newvar = rank(oldvar), track- but
this returns a newvar in which the lowest variable is given 1st
position, which is fine, but if there are say 3 ties for position 1,
the second lowest oldvar is ranked in 4th position rather than 2nd
position which is what I need. Any ideas as to how I could create a
newvar where ties do not change the rank position of following
observations within each group?
--
Best Regards,

James Cross
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