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 the manova/anova
function or something else.
Please write me an illustrative example.
Many thanks.

Best regards,
Gian Mauro Manzoni

2012/7/25 Greg Snow <538280@gmail.com>

> 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 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" factor ?
>>
>> Thank you very much in advance for any help!
>>
>> Best regards,
>> Mauro
>>
>> --
>> Dr. Gian Mauro Manzoni
>> PhD, PsyD
>> Psychology Research Laboratory
>> San Giuseppe Hospital
>> Istituto Auxologico Italiano
>> Verbania - Italy
>> e-mail: gm.manzoni@auxologico.it
>> cell. phone +39 338 4451207
>> Tel. +39 0323 514278
>>
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>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
> --
> Gregory (Greg) L. Snow Ph.D.
> 538280@gmail.com
>



-- 
Dr. Gian Mauro Manzoni
PhD, PsyD
Psychology Research Laboratory
San Giuseppe Hospital
Istituto Auxologico Italiano
Verbania - Italy
e-mail: gm.manzoni@auxologico.it
cell. phone +39 338 4451207
Tel. +39 0323 514278

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