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Re: st: A query about min in stata


From   Nick Winter <nwinter@virginia.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: A query about min in stata
Date   Fri, 22 Aug 2008 11:48:33 -0400

Combining fun/elegance and speed, perhaps:


forval i=1/9 {
  local list `list',L`i'.r
}
gen min=min(r,`list')




--Nick Winter





Nick Cox wrote:
As a curiosity note this alternative:
gen min = r qui forval i = 1/9 { replace min = min(min, L`i'.r) }
I'll guess that it will be slower, but it looks more fun.
The tedious solution of just writing out all the terms is probably
fastest.
Nick n.j.cox@durham.ac.uk
Eva Poen

if you can -tsset- your data, you could do

gen min = min(r, L1.r, L2.r, L3.r)

etc. up to L9.r. If your data are not a time series or a panel, you
can still generate a row identifier and -tsset- on that:

gen id = _n
tsset id

2008/8/22 Ashim Kapoor <ashimkapoor@gmail.com>:


I am trying to do the following : -

I have a variable r. I want to create a variable m=min( r, r[_n-1],
... ,r[_n-9])

I guess I can use a while loop to do this but that is quite slow. An
alternative would be to define r0=r,r1=r[_n-1],..,r9=r[_n-9]
and then say m=rmin ( r0 r1 ... r9).

My question is that is there a built in way in stata to do this ? like
say by using egen ?
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--------------------------------------------------------------
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Assistant Professor                             434.924.3359 f
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University of Virginia          faculty.virginia.edu/nwinter w
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