R help - Nov 2005 - glm x^2

R-users,

I'm having some trouble getting .glm and glm.nb to run a polynomial. 
I've used x*x and x^2 and neither works.  I've checked out the archives
and they refer to an archive that's no longer working.  

I've seen that they use poly() but I'm following up my analysis with
cv.glm so I'd prefer to keep using glm.  It's easier to just add a
column to my data but I'd rather code it.

Thanks for the response... I appreciate the people that work on the
list.

Jeff

****************************************
Jeffrey A. Stratford, Ph.D.
Postdoctoral Associate
331 Funchess Hall
Department of Biological Sciences
Auburn University
Auburn, AL 36849
334-329-9198
FAX 334-844-9234
http://www.auburn.edu/~stratja

I think you want:

glm(y ~ x + I(x^2), ...)

This is shown as an example on pg 50 of "An Introduction to R" 
(R-2.2.0-pdf).

HTH,

--sundar

Jeffrey Stratford wrote:
> R-users,
> 
> I'm having some trouble getting .glm and glm.nb to run a polynomial. 
> I've used x*x and x^2 and neither works.  I've checked out the
archives
> and they refer to an archive that's no longer working.  
> 
> I've seen that they use poly() but I'm following up my analysis
with
> cv.glm so I'd prefer to keep using glm.  It's easier to just add a
> column to my data but I'd rather code it.
> 
> Thanks for the response... I appreciate the people that work on the
> list.
> 
> Jeff
> 
> ****************************************
> Jeffrey A. Stratford, Ph.D.
> Postdoctoral Associate
> 331 Funchess Hall
> Department of Biological Sciences
> Auburn University
> Auburn, AL 36849
> 334-329-9198
> FAX 334-844-9234
> http://www.auburn.edu/~stratja
> 
> ______________________________________________
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