R help - Nov 2002 - estimate statement?

Dear all,

I have a question about linear models.
Is there something comparable to the estimate statement in SAS?

E.g.
proc mixed data=test;
	class x1 x2;
	model y=x1|x2 /s;
	estimate 'x1' x1 -1 1         x1*x2 -0.5 -0.5  0.5  0.5;
	estimate 'x2'         x2 -1 1 x1*x2 -0.5  0.5 -0.5  0.5;
run; 

Thanks for the help,

Dominik

Dominik Grathwohl 
Biostatistician 
Nestl? Research Center 
PO Box 44, CH-1000 Lausanne 26 
Phone: + 41 21 785 8034 
Fax: + 41 21 785 8556 
e-mail: dominik.grathwohl at rdls.nestle.com 


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On Wed, 6 Nov 2002, Grathwohl,Dominik,LAUSANNE,NRC/NT wrote:
> Dear all,
>
> I have a question about linear models.
> Is there something comparable to the estimate statement in SAS?
>
> E.g.
> proc mixed data=test;
> 	class x1 x2;
> 	model y=x1|x2 /s;
> 	estimate 'x1' x1 -1 1         x1*x2 -0.5 -0.5  0.5  0.5;
> 	estimate 'x2'         x2 -1 1 x1*x2 -0.5  0.5 -0.5  0.5;
> run;
>
There are various things.  The C() function and the contrasts option to lm
allow a set of contrasts to be specified for each variable.

The contrast() function in the gregmisc package allows you to estimate
different contrasts from a fitted model.

	-thomas


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