[R] Contrasts

Warnes, Gregory R gregory_r_warnes at groton.pfizer.com
Wed Jun 2 14:58:23 CEST 2004

Try the fit.contrast() and estimable() functions from my gregmisc package,
or the contrasts() function in Frank Harrell's Design package.


> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Kimberly Ann
> Fernandes
> Sent: Monday, May 31, 2004 1:10 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Contrasts
> Hello,
> I am trying to figure out how to conduct a t-test on a 
> specific contrast
> for my data.  I have four factors in my data and would like 
> to conduct a
> t-test on the average of the data from the first two factors 
> against the
> average of the data on the second two factor (i.e. is the 
> average of the
> first two different from the average of the second two).  Is there a
> quick way to do this?  I found the contrast function, but wasn't sure
> how to apply it.
> Thank you,
> Kim
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