R help - Nov 2003 - Contrast

Could anyone please explain how to set up contrasts between means in R. I want
to know if "before I conduct an experiment and believe the mean for 1 and 2
will be different from means 3 and 4, Is this true?"  That is what I have
to prove or disprove, I thought that contrasts would be the way to go. Thanks
for the help.

Igor
	[[alternative HTML version deleted]]

see ?fit.contrast in library gregmisc.

Cheers,

Simon.

Simon Blomberg, PhD
Depression & Anxiety Consumer Research Unit
Centre for Mental Health Research
Australian National University
anu.edu.au/cmhr
Simon.Blomberg at anu.edu.au  +61 (2) 6125 3379

> -----Original Message-----
> From: Igor Roytberg [mailto:ir1982 at u.washington.edu]
> Sent: Wednesday, 5 November 2003 12:04 PM
> To: R-help at stat.math.ethz.ch
> Subject: [R] Contrast
> 
> 
> Could anyone please explain how to set up contrasts between 
> means in R. I want to know if "before I conduct an experiment 
> and believe the mean for 1 and 2 will be different from means 
> 3 and 4, Is this true?"  That is what I have to prove or 
> disprove, I thought that contrasts would be the way to go. 
> Thanks for the help. 
> 
> Igor
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> stat.math.ethz.ch/mailman/listinfo/r-help
>

Or ?contrast in the Design library.

-G
> -----Original Message-----
> From: Simon Blomberg [mailto:Simon.Blomberg at anu.edu.au]
> Sent: Tuesday, November 04, 2003 8:32 PM
> To: Igor Roytberg; R-help at stat.math.ethz.ch
> Subject: RE: [R] Contrast
> 
> 
> see ?fit.contrast in library gregmisc.
> 
> Cheers,
> 
> Simon.
> 
> Simon Blomberg, PhD
> Depression & Anxiety Consumer Research Unit
> Centre for Mental Health Research
> Australian National University
> anu.edu.au/cmhr
> Simon.Blomberg at anu.edu.au  +61 (2) 6125 3379
> 
> 
> > -----Original Message-----
> > From: Igor Roytberg [mailto:ir1982 at u.washington.edu]
> > Sent: Wednesday, 5 November 2003 12:04 PM
> > To: R-help at stat.math.ethz.ch
> > Subject: [R] Contrast
> > 
> > 
> > Could anyone please explain how to set up contrasts between 
> > means in R. I want to know if "before I conduct an experiment 
> > and believe the mean for 1 and 2 will be different from means 
> > 3 and 4, Is this true?"  That is what I have to prove or 
> > disprove, I thought that contrasts would be the way to go. 
> > Thanks for the help. 
> > 
> > Igor
> > 	[[alternative HTML version deleted]]
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > stat.math.ethz.ch/mailman/listinfo/r-help
> >
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> stat.math.ethz.ch/mailman/listinfo/r-help
> 

LEGAL NOTICE\ Unless expressly stated otherwise, this messag...{{dropped}}