See the Details section of ?lm where its all discussed.

On Sun, Nov 29, 2009 at 11:46 AM, Carl Witthoft <carl@witthoft.com> wrote:

> Hi,
> A recent thread provided a (working) construct for lm:
>
> lm(as.matrix(freeny[ix]) ~., freeny[-ix])
>
>
> Can someone explain what is meant by the formula in that expression,
> that is,  what does "mymatrix~."  do?  I couldn't find any such example in
> the lm() or formula() help pages.
>
> thanks
> Carl
>
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