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
[email protected]
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