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RE: st: FW: How to keep only firms that have at least two consecutive years of data
From
umut senalp <[email protected]>
To
<[email protected]>
Subject
RE: st: FW: How to keep only firms that have at least two consecutive years of data
Date
Thu, 5 Jul 2012 17:56:02 +0300
Dear Anees,
Thank you for your reply, the thing is, all firms have 9 consecutive years of observation for the 5 variables but with missing. What I am trying to do is to keep only firms have observation for all the variables and have it at least two consecutive years. When I follow this
xtset id year
> bys id: gen nyear=[_N]
> keep if nyear>1 , this does not drop any observation at all, since all id's have 9 years data for the variables.
Thanks,
Umut
----------------------------------------
> Date: Thu, 5 Jul 2012 19:13:16 +0500
> Subject: Re: st: FW: How to keep only firms that have at least two consecutive years of data
> From: [email protected]
> To: [email protected]
>
> Check this might help you.
>
> xtset id year
> bys id: gen nyear=[_N]
> keep if nyear>1
>
> Hope this works.
> Anees
>
>
> On Thu, Jul 5, 2012 at 7:04 PM, umut senalp <[email protected]> wrote:
> >
> > Dear Statalist,
> > I have a panel of 1250 units (firms) and five variables (with missing values), for the time period of 2003 to 2011. I would like to keep only firms that have a minimum of 2 consecutive annual observations for all variables together. I would be glad if you could help me to write a code for it.
> > Regards
> > Umut
> > *
> > * For searches and help try:
> > * http://www.stata.com/help.cgi?search
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
>
>
>
> --
>
> Best
> ---------------------------
> Muhammad Anees
> Assistant Professor/Programme Coordinator
> COMSATS Institute of Information Technology
> Attock 43600, Pakistan
> http://www.aneconomist.com
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/