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: Polynomial in Time in an Unbalanced Panel


From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: Polynomial in Time in an Unbalanced Panel
Date   Fri, 18 Jun 2010 07:55:39 -0700 (PDT)

--- On Fri, 18/6/10, natasha agarwal wrote:
> I tried
> 
> egen t1=group(year)
> gen t2=t1^2
> gen t3=t1^3
> 
> But am not sure if this is correct for an unbalanced
> panel?

The -egen- step sounds dangerous an un-necessary to me
(regardless of whether this balanced or un-balanced panel
data or cross sectional data). I would just substract 
some meaningfull timepoint from your year variable to 
make sure that 0 zero is located within the range of 
your data. Other than that it looks ok to me.

-- Maarten

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

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


      

*
*   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