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Re: st: Trend Regression Coefficients of Ordinal Predictor


From   Tim Wade <wadetj@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Trend Regression Coefficients of Ordinal Predictor
Date   Tue, 15 Jan 2013 14:22:04 -0500

This discussion might also be useful:

http://www.stata.com/statalist/archive/2006-01/msg00643.html

Tim Wade


On Tue, Jan 15, 2013 at 10:15 AM, Karman Tandon <karmantandon@gmail.com> wrote:
>
> Hi Billy & the rest of Statalist,
>
> In many papers, a continuous variable will be regressed across
> quintiles of another variable, resulting in a beta coefficient for
> each level of the predictor variable. Then, the authors will write a
> "p for trend" to show that the beta coefficients are significantly
> trending as the levels of the predictor variable increase or decrease.
> What does "p for trend" mean statistically, and how can I arrive at a
> "p for trend" using Stata?
>
> Here is an example of the above in a table from a journal article in
> Cancer Epidemiology, that anyone should be able to access:
> http://cebp.aacrjournals.org/content/14/12/2881/T3.expansion.html
>
> Thanks!
> Karman Tandon
>
> PS this is my first post, so please forgive any mistakes
>
>
> On Tue, Jan 15, 2013 at 1:04 AM, William Buchanan
> <william@williambuchanan.net> wrote:
> >
> > Please read the Statalist FAQ prior to submitting a query like you were
> > asked when joining the list (specifically the section regarding the use of
> > full names).  Your question is also fairly vague and you may want to
> > illustrate what you want more explicitly to get an answer.
> >
> > HTH,
> > Billy
> >
> > Sent from my iPhone
> >
> > On Jan 14, 2013, at 21:45, karmantandon <karmantandon@gmail.com> wrote:
> >
> > > I am fitting a regression model with a normally distributed outcome
> > > (y)
> > > and an ordinal variable in 4 levels (x) as predictor, along with other
> > > variables (a, b), using the command
> > >
> > > regress y i.x a b
> > >
> > > I get separate coefficients for the levels of the predictor x while
> > > the
> > > first level is treated as reference. I would like to demonstrate that
> > > the
> > > coefficients of the ordinal variable levels are trending in a certain
> > > direction with the variable itself. Is there a way to demonstrate
> > > this?
> > >
> > > Thank you!
> > >
>
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