On Jan 2, 2013, at 10:09 PM, Bert Gunter wrote:
Below ...
-- Bert
On Wed, Jan 2, 2013 at 9:54 PM, David Winsemius <dwinsem...@comcast.net
> wrote:
...
Search on "orthogonal polynomials".
Yes, but this does not explain what these have to do with ordered
factors and contrasts in a linear model.
That information is contained in "An Introduction to R," the
tutorial that ships with R and which the OP should have perused
before posting. Detailed explanation beyond that is too technical
for here, I would say.
The material in "Intro to R" is, I think all will agree, rather
sketchy. I think this strategy will be more productive:
http://lmgtfy.com/?q=%22orthogonal+polynomials%22+linear+models
Second link was:
www.stats.ox.ac.uk/pub/StatMeth/Linear2_04.pdf
--
David.
-- Bert
Note that my question is not on lm (I think), but rather on how lm
outputs the results of regressions involving ordered predictors. Some
references would be great.
Please post responses to this mailing list.
As always.
Thanks very much again for all your help!
--
David Winsemius, MD
Alameda, CA, USA
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--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
David Winsemius, MD
Alameda, CA, USA
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
