Hi Cleland and Dennis,

thanks a lot for the answer.


Ashok Varma

On Mon, Nov 23, 2009 at 5:05 PM, Chuck Cleland <ccleland@optonline.net>wrote:

>  On 11/23/2009 1:06 AM, ashok varma wrote:
> > hello,
> >
> > i am fitting a Linear model using R. I have to fit the model considering
> all
> > the interaction effects of order 1 of the independent variables. But I
> have
> > 9 variables. So, it will be difficult for me to write all the 36
> > combinations in the model. Can anyone please help how to get this done in
> > much smarter way??
>
>  This will include all main effects and two-way interactions:
>
> lm(Y ~ (A + B + C + D + E + F + G + H + I)^2, data=mydata)
>
> > thanks a lot,
> > Ashok Varma.
> >
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> >
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>
> --
> Chuck Cleland, Ph.D.
> NDRI, Inc. (www.ndri.org)
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