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RE: st: Re: grading


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Re: grading
Date   Tue, 10 Jun 2003 20:23:59 +0100

It is a matter of where counting starts. 

Stata, like most (all?) statistical software, 
assigns low ranks etc. to low values. 

You want to slice off the high values, the top 15% etc., so 
you must count down from the top. 

pctile gr = score, nq(20) 
xtile pc = score, cut(gr) 
g str9 grade="Fail" 
replace grade="Honors" if pc >=18
replace grade="High Pass" if pc>12 & pc<18 

etc. 

Nick 
n.j.cox@durham.ac.uk 


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