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Re: st: interpretation of squared term


From   David Bai <db555@mail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interpretation of squared term
Date   Thu, 26 Aug 2010 15:39:48 -0400

Thank you, Maarten.

I include the squared term because this year variable might be non-linearly related to the outcome. Is there an easier way to roughly interpret the year effect? I do not want to go deeper to have an exact interpretation of the two year variables. E.g., what does a negative coefficient for a squared term mean? Thank you.


-----Original Message-----
From: Maarten buis <maartenbuis@yahoo.co.uk>
To: statalist@hsphsun2.harvard.edu
Sent: Thu, Aug 26, 2010 3:28 pm
Subject: Re: st: interpretation of squared term


--- On Thu, 26/8/10, David Bai <db555@mail.com> wrote:
  I have a question regarding how to interpret squared
term:

You can only interpret the time trend graphically. If you
want to have a non-linear trend where you can interpret
the coeficients, you can look at a linear spline, see
-help mkspline-.

Hope this helps,
Maarten

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

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




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