21 PM
> To: jesse@sympatico.ca
> Cc: r-help@r-project.org
> Subject: Re: [R] MANOVA polynomial contrasts
>
> Dear Prof. John Fox,
> I found the paper very useful. Thank you very much for attaching the link!
> Which type of SS (II or III) do you suggest for a multivariate mod
GMM,
>
> > -Original Message-
> > From: Manzoni, GianMauro [mailto:gm.manz...@auxologico.it]
> > Sent: July-30-12 9:49 AM
> > To: John Fox
> > Cc: r-help@r-project.org; Greg Snow
> > Subject: Re: [R] MANOVA polynomial contrasts
> >
> > Dear Prof. Jo
Dear Prof. John Fox,
thank you very much for your suggestions.
However, I still do not know how to use the contrasts after generating them.
Once I generate the matrix with the polynomial contrasts, what are the
following steps toward the statistical test?
A whole example would be very useful.
Tha
Dear GMM,
> -Original Message-
> From: Manzoni, GianMauro [mailto:gm.manz...@auxologico.it]
> Sent: July-30-12 9:49 AM
> To: John Fox
> Cc: r-help@r-project.org; Greg Snow
> Subject: Re: [R] MANOVA polynomial contrasts
>
> Dear Prof. John Fox,
> thus all I shou
Dear Prof. John Fox,
thus all I should do to test quadratic and cubic effects is to change the
second argument of the linearHypothesis() function, right?
So, for testing the cubic effect:
> linearHypothesis (mod, "f.C")
Is there a chapter or paragragh about contrasts in your book "An R
companion
Dear Gian Mauro,
On Mon, 30 Jul 2012 14:44:44 +0200
"Manzoni, GianMauro" wrote:
> Dear Prof. John Fox,
> thank you very much for your suggestions.
> However, I still do not know how to use the contrasts after generating them.
> Once I generate the matrix with the polynomial contrasts, what are t
Dear Gian,
How contrasts are created by default is controlled by the contrasts option:
> getOption("contrasts")
unordered ordered
"contr.treatment" "contr.poly"
So, unless you've changed this option, contr.poly() will be used to generate
orthogonal polynomial contrasts
Dear Greg Snow,
thank you very much for your suggestions. However, I need an example in
order to understand fully.
I was told that, given the ordinal factor, I do not need to specify the
contr.poly function because R does it automatically.
However, I don not know if I have to add an argument into t
You should not need to write them yourself. Look at the contr.poly function
along with the C function (Note uppercase C) or the contrasts function.
On Monday, July 23, 2012, Manzoni, GianMauro wrote:
> Dear all,
> I am quite new to R and I am having trouble writing the polynomial
> contrasts for
Dear all,
I am quite new to R and I am having trouble writing the polynomial
contrasts for an ordinal factor in MANOVA.
# I have a model such as this
fit<-manova(cbind(Y1,Y2,Y3)~Groups,data=Events) # where groups is an
ordinal factor with 4 levels
# how to set polynomial contrasts for the "Groups"
10 matches
Mail list logo
