[Rd] Guidelines for writing model term functions (?)
Roger D. Peng
rpeng at jhsph.edu
Fri Jul 2 16:18:06 CEST 2004
Are there any general guidelines for writing functions that appear in
model formulas for functions like lm()/glm()? The ones I can think of
are ns()/bs() in `splines' and s() in `mgcv'. It seems that ns()/bs()
basically create matrix with a number of attributes and a class, while
s() returns a list of parameters. It seems that gam() in `mgcv' has
its own way of dealing with formulas so maybe that's not a great
example, but are there any suggestions for writing a function that
might appear in the formula for, say, lm() or glm()?
Thanks,
-roger
--
Roger D. Peng
http://www.biostat.jhsph.edu/~rpeng/
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