st: Area under a percentile point

[zeynep elitaş <zelitas@gmail.com>]

I have a simple question which I do not have the answer for. Is there
a way to tell Stata to keep the data under a certain percentile point
and drop the rest?  This is important since in my data a percentile
point has often the same value as the ones below and over it.

Thanks
Zeynep Elitaş

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