Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: Regressions with dependent continuous variable with bounded range

From   David Hoaglin <>
Subject   Re: st: Regressions with dependent continuous variable with bounded range
Date   Sun, 18 Dec 2011 14:11:04 -0500

Dear All,

Is it well-established that the effect is quadratic in x, as opposed
to being nonlinear in x (the functional form might be quadratic or
something else entirely)?  If the form is not necessarily quadratic, a
good strategy would fit the linear term in x and then examine the
pattern of nonlinearity by plotting the residuals against x.  A
quadratic term can provide a reasonable approximation for some
patterns of nonlinearity, but not for others.

Also, centering x at a suitable value (often near the middle of its
range) would be a good preliminary step.

David Hoaglin

On Sun, Dec 18, 2011 at 11:56 AM, Suryadipta Roy <> wrote:
> Dear Brendan and Nick,
> Thank you so much for the detailed suggestions! I will try to
> implement these. Infact, I was just reading the paper by Papke and
> Wooldridge (Journal of Econometrics, 2008) "Panel data methods for
> fractional response variables with an application to test pass rates"
> in order to understand the application better.
> Best regards,
> Suryadipta.
*   For searches and help try:

© Copyright 1996–2016 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index