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RE: st: FW: How to keep only firms that have at least two consecutive years of data


From   umut senalp <uerksan@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: FW: How to keep only firms that have at least two consecutive years of data
Date   Thu, 5 Jul 2012 18:58:44 +0300

Dear Nick, 
Thank you very much for your reply.
Umut

----------------------------------------
> Date: Thu, 5 Jul 2012 16:06:58 +0100
> Subject: Re: st: FW: How to keep only firms that have at least two consecutive years of data
> From: njcoxstata@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> In the light of this crucial detail my previous suggestion can be modified to
>
> drop if missing(var1, var2, var3, var4, var5)
> bysort id (year) : gen spacing = year - year[_n-1]
> bysort id (spacing) : keep if spacing[1] == 1
>
> On Thu, Jul 5, 2012 at 3:56 PM, umut senalp <uerksan@hotmail.com> wrote:
>
> > 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.
>
> From: anees@aneconomist.com
>
> >> Check this might help you.
> >>
> >> xtset id year
> >> bys id: gen nyear=[_N]
> >> keep if nyear>1
>
> On Thu, Jul 5, 2012 at 7:04 PM, umut senalp <uerksan@hotmail.com> wrote:
>
> >> > 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.
>
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