st: is ordering with -bysort- unique?

[Radu Ban <rban@nber.org>]

dear all,

i'm cleaning a dataset and i encounter repeated ids. i want to keep them 
unique, but the problem is that for some repeated ids the variables differ. 
i want to keep just one of the repeated ids. so i'm using:

bysort id: keep if _n == 1

now i would like to know if this will keep the same id whenever the program 
is run. or does the ordering change?

sorry for such a basic question but right now i don't have access to the 
manuals.

thanks so much,

radu ban



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