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Re: st: panel data-dropping all observations for the identifier when certain variable value is missing


From   Muhammad Anees <anees@aneconomist.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: panel data-dropping all observations for the identifier when certain variable value is missing
Date   Wed, 6 Jul 2011 08:32:49 +0500

drop xvar if date<datein2008 will drop all those observations with
missing datein2008 observations too as I guess. but the inverse
command of -keep-ing will do the job. You can use

keep xvar if date>datein2008
keep xvar if date>datein2007
keep xvar if date>datein2006
etc.


Hope this works

Anees


On Wed, Jul 6, 2011 at 5:07 AM, Sabrina Helmut <vitamint@hotmail.de> wrote:
>
>
> Dear all,
>
> I am struggling with the following:
>
> I have firm-year observations for the years 2003-2010. For cases where the last value for the variable <offdate>, which is a variable containing dates, is older than a
> date in 2008 (so date in 2007, 2006,...) then stata shall drop the firm/identifier at all, so for
> every year. Then, I want stata to show me for every firm/identifier the last entry for the variable <offdate>, which could then either be a date in 2008, 2009 or 2010. Which commands could help me doing this?
>
> Thanks,
> Sabrina
>
>
>
>
>
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>



-- 
Muhammad Anees
MSc & MS in Economics

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