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RE: st: Creating a dummy variable under certain conditions


From   sebas nicaise <sebasnicaise@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Creating a dummy variable under certain conditions
Date   Mon, 4 Jun 2012 09:38:56 +0000

Nick your code is almost right. Only it gives a 1 for these cases while it should not:

date gvkey viol myindicator
2000q3 1045 0 0
2000q4 1045 0 0
2001q1 1045 0 0
2001q2 1045 0 0
2001q3 1045 1 1
2001q4 1045 1 0
2002q1 1045 0 0
2002q2 1045 0 0
2002q3 1045 0 0
2002q4 1045 1 1
2003q1 1045 1 0
2003q2 1045 0 0

You see, because viol is 1 again after the new viol reported a 1. So it is wrong because there are only 3 quarters of 0 in the viol dummy.


Abrihmanyu, in your code it gives to few 1's But if it reports a 1 it is right. I do not see the error in the code...
 
 
 
 
----------------------------------------
> Date: Mon, 4 Jun 2012 09:41:24 +0100
> Subject: Re: st: Creating a dummy variable under certain conditions
> From: njcoxstata@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> bysort gvkey (date) : gen cuviol = sum(viol)
> by gvkey : gen myindicator = (viol == 1) & (cuviol[_n-1] ==
> cuviol[_n-4]) & _n> 4
>
> Nick
>
> On Mon, Jun 4, 2012 at 9:22 AM, sebas nicaise <sebasnicaise@hotmail.com> wrote:
>
>> It is important that new viol dummy can only be 1 if viol is 1 and in the previous 4 quarters viol is 0.
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