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st: RE: insert obs of one file at the beginning of another file


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: insert obs of one file at the beginning of another file
Date   Fri, 22 Nov 2002 19:22:31 -0000

Daniel Müller
>
> I would like to insert observations (format: %12s) of one
> variable of a file with 10 obs <head.dta> at the beginning
> of several variables (converted to strings) of another file
> <boss.dta> and shift the remaining observations from
> <boss.dta> these 10 obs back. I appended <head.dta> to
> <boss.dta>, then replaced every empty observation at the end
> of <boss.dta>. But here I get stuck. How can I efficiently
> put the string variables from the end to the beginning?
>
> P.S.: Speed is an issue as <boss.dta> has 1.7 mio obs!


In the last sentence, Daniel means "observations" not
variables (pers.comm.).

gen long which = cond(_n <= 10, _N + _n, _n)
sort which

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

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