I noticed that when I fit a linear model using 'lm' there is an attribute
called "factors" that is added to the "term". It doesn't seem to appear for
'model.matrix', just 'lm'. I have been unable to find where it gets constructed
or what it means? It looks like a two dimensional array that I may be able to
use so I would just like to get some 'official' statement regarding what it is
and how it is constructed. I would rather not go on my assumptions. An example
would be like:
> l <- lm(prestige ~ income + education, data=Duncan)
> attr(l$terms,"factors")
income education
prestige 0 0
income 1 0
education 0 1
Thank you.
Kevin Burton
rkevinbur...@charter.net
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