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Re: st: problems with using preserve in looping


From   William Buchanan <william@williambuchanan.net>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: problems with using preserve in looping
Date   Fri, 24 May 2013 11:12:11 -0400

What about:

bys year: g B=A*matrix if inrange(year,1991,2011)



Sent from my iPhone

On May 24, 2013, at 10:55, ken first <kenscholar2008@gmail.com> wrote:

> Dear stata users,
> 
> I have two questions here and i hope someone can help.
> 
> 1. I am wondering if someone knows about this strange thing with the
> looping command. I used the below. sometimes it works and everything
> runs smoothly and sometimes i get an error message. Does anyone know
> what i did wrong here?
> 
> first i have
> 
> predict A, e
> 
> then
> 
> forvalue year = 1991/2011 {
> preserve
> keep if  year==`year'
> gen B=A*matrix
> restore
> }
> 
> already preserved
> r(621);
> 
> 
> 
> 2. I need to use the below as there is a matrix that wont work if i
> simply use if year==`year', but i would like to keep the results I
> generated after everything has been restored. does anyone know what to
> do?
> 
> 
> first i have
> 
> predict A, e
> 
> then
> 
> forvalue year = 1991/2009 {
> preserve
> keep if  year==`year'
> gen A=B*matrix   * i would like to keep the result here as a separate variable.
> restore
> }
> 
> Many thanks
> 
> Ken
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