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RE: st: A query about min in stata


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: A query about min in stata
Date   Fri, 22 Aug 2008 16:35:21 +0100

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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