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Re: st: problems with using preserve in looping


From   ken first <kenscholar2008@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: problems with using preserve in looping
Date   Fri, 24 May 2013 16:24:26 +0100

it really needs to delete other years in order to allow the matrix to
work, but i would like to keep the results it generates for every set
of periods.

On 24 May 2013 16:20, ken first <kenscholar2008@gmail.com> wrote:
> thanks...however i am using a common (not gen) that can not combine with by.
>
> On 24 May 2013 16:12, William Buchanan <william@williambuchanan.net> wrote:
>> 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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