[R] Difference in ANOVA results - R vs. JMP/Minitab

Liaw, Andy andy_liaw at merck.com
Thu Nov 20 22:56:12 CET 2003

> From: Nirmal Govind [mailto:nirmalg at psu.edu] 
> Thanks for your reply, Prof. Ripley.
> > And all of that is explained in the reference on the aov help page. 
> > Please do stop speculating and start reading.
> Well, the reason for speculation was cos I couldn't find any 
> details on 
> that help page... thanks for letting me know that the 
> reference explains 
> this...
> > AoV has nothing to do with coefficients.  There is 
> dummy.coef to get 
> > uncoded coefficients, and there is options(contrasts=) to set the 
> > coding.
> Ok, I will try these...
> > Yes, you should read a lot more.  Chapter 6 of Venables & Ripley 
> > (2002)
> > and chapter 5 of Chambers & Hastie (1991) would be a good start.
> Oh, I most definitely should! :-) .. I guess I was hoping that such 
> details would be included in the help page for the function 
> or mentioned 
> in some R introduction or tutorial or so on the Documentation page.. 
> looks like that's not the case so I'll get a hold of the 
> books above...
> Thanks,
> nirmal

It's unreasonable to expect stat software documentation to also serve as
textbooks or reference books.  What you have not learned in a course can not
be made up just by reading help pages.  That's not the purpose of help


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