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RE: st: How to generate dummy for the following years


From   umut senalp <uerksan@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: How to generate dummy for the following years
Date   Thu, 26 Jul 2012 18:59:20 +0300

Dear Ronnie,

Thank you for your reply, I provided a small part of the data below, as can be seen some firms provided information for all 2003-2011 period while some of them did it for shorter period, for instance the firm which has id no: 00144277 observed only between 2007-2010. My aim is to do some kind of treatment effect analysis (effect of exporting on firm productivity in my case) by using propensity score matching approach. I already matched the data (regarding to their probability to export), now I want to analyse the export effect for the firms started to export and the effect for the following years. I copied and pasted some data since I think we cannot post attachments to Statalist. Thanks again.

Best 

Umut 

firm id  year export
00028073 2003 1
00028073 2004 1
00028073 2005 0
00028073 2006 1
00028073 2007 0
00028073 2008 1
00028073 2009 1
00028073 2010 1
00028073 2011 1
00036721 2003 0
00036721 2004 0
00036721 2005 0
00036721 2006 0
00036721 2007 0
00036721 2008 0
00036721 2009 0
00036721 2010 0
00047152 2003 1
00047152 2004 1
00047152 2005 1
00047152 2006 0
00047152 2007 0
00047152 2008 0
00047152 2009 0
00047152 2010 0
00047152 2011 1
00063351 2010 1
00063351 2011 1
00144277 2007 1
00144277 2008 1
00144277 2009 0
00144277 2010 1
00144614 2009 0
00144614 2010 0
00145362 2003 1
00145362 2004 1
00145362 2005 1
00147034 2003 1
00147034 2004 1
00147034 2005 1
00147034 2006 1
00147034 2007 1
00147034 2008 1
00147034 2009 1
00147034 2010 1


----------------------------------------
> Date: Thu, 26 Jul 2012 18:16:50 +0300
> From: rb.glists@gmail.com
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: How to generate dummy for the following years
>
> Umut
>
> I think this kind of question is best answered if you show some data (and may be what you are trying to achieve). You could use the very helpful -writeinput- (-ssc install writeinput-) to do this.
>
> Ronnie
>
> --
> 010100100110111101101110011011100110100101100101
>
>
>
>
> On Thursday, July 26, 2012 at 6:07 PM, umut senalp wrote:
>
>> Dear Stata Listers,
>>
>> I am using StataSE 12. I have an unbalanced data for over 2000 firms (covering the period 2003-2011) and I have a dummy variable for the firms' export status (Export=1 if firm have positive export value that year). While, a few firms observed for all 9 years (2003-2011), majority of them observed for minimum 2 years consecutively.
>> I want to create a new set of dummy variables indicating the year that a firm started to export (Starter),
>> one year before starting to export (Year_before),and for the following two years that the firm started to export which are Year_After and Two_Years_After.
>> So, I want to generate 4 new dummies based on the firm's Export status. In addition to that, I have some firms which are exporter for the all period that they are observable (means I do not know when they started to export), and I want to name them as Always_Exporter.
>>
>> Since I am not so familiar with programming in Stata I tried following command but it failed, it was just for the firms that I have observation for 2003 onwards, anyway.
>> gen starter=0
>> replace starter=1 if export==0 in 2003 & export==1 in 2004
>>
>> And I realised that this approach will not work since I need to do it for many times for following years to catch all starters.
>>
>> Well, I think I need to use a program that includes loop but I don't know where to start to write the code. I would be glad if you could help me on this issue. I hope I've the issue clear enough.
>>
>> Kind regards
>>
>> Umut SENALP
>> *
>> * 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/
>
>
>
> *
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> * http://www.ats.ucla.edu/stat/stata/
 		 	   		  
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