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Re: st: dummy variable


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dummy variable
Date   Fri, 16 Sep 2011 10:00:09 +0200

On Fri, Sep 16, 2011 at 2:09 AM, Jing Zhou wrote:
> I have a sample period from 2000-2009. now I am considering to add a dummy variable into the regression. for the year of 2009, only 24 out of 550 observations (<5%) valued at 1 of this dummy. for 2008, 31 out of 502 observations (<5%) valued at 1. further, for the year of 2000-2002, the missing value rate is 61.19%, 31.91%, and 13.33%, respectively. for other variables of the regression, i can get relatively complete data value of each observation. therefore, is it still necessary to include this dummy in my regression? thanks!

What is this dummy variable supposed to measure?

-- Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
--------------------------

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