[R] constructing a formula
Michaell Taylor
pols1oh at bestweb.net
Mon Aug 5 23:52:38 CEST 2002
Dear Listers,
I am having trouble figuring out how to build a formula using a variable
list. For example, I have:
a _ data.frame(a=rnorm(1000))
a$b_rnorm(1000)+.5*a$a
a$c_rnorm(1000)+.5*a$b
a$d_rnorm(1000)+.5*a$b+.1*a$a
attach(a)
and I estimate,
lm(d ~ b+c+d)
BUT,
I wish to construct a generalized solution in which,
ListOfVar _ c('b','c','d')
The question is how to leverage ListOfVar into the constuction of the
formula lm(a$d ~ a$b+a$c+a$b). I know this must be fairly simple, but
unfortunately my readings of the various help files/books haven't been
productive yet.
Any help would be appreciated. Thanks in advance.
Michaell Taylor
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