# [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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```