[Rd] Guidelines for writing model term functions (?)

From: Roger D. Peng <rpeng_at_jhsph.edu>
Date: Sat 03 Jul 2004 - 00:18:06 EST


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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