Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


From   Nick Cox <[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 16:06:58 +0100

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 <[email protected]> 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: [email protected]

>> 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 <[email protected]> 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.

*
*   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/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index