> On Nov 25, 2015, at 9:23 AM, Fox, John <j...@mcmaster.ca> wrote:
>
> Dear Angelo,
>
> I'm afraid that this is badly confused. To use Anova() for repeated measures,
> the data must be in "wide" format, with one row per subject. To see how this
> works, check out the OBrienKaiser example in ?Anova and ?OBrienKaiser, or for
> more detail, the R Journal paper at
> <{http://journal.r-project.org/archive/2013-1/RJournal_2013-1_fox-friendly-weisberg.pdf>.
I got an error with that link, but this link succeeded:
https://journal.r-project.org/archive/2013-1/fox-friendly-weisberg.pdf
>
> I hope this helps,
> John
>
> -----------------------------------------------
> John Fox, Professor
> McMaster University
> Hamilton, Ontario, Canada
> http://socserv.socsci.mcmaster.ca/jfox/
>
>
>
>> -----Original Message-----
>> From: angelo.arc...@virgilio.it [mailto:angelo.arc...@virgilio.it]
>> Sent: Wednesday, November 25, 2015 11:30 AM
>> To: r-help@r-project.org
>> Cc: Fox, John
>> Subject: Syntax error in using Anova (car package)
>>
>> Dear list members,
>> I am getting an error while performing a repeated measures MANOVA using
>> the Anova function
>> of the "car" package. I want to apply it on the results of an experiment
>> involving 19 participants,
>> who were subjected to 36 stimuli, each stimulus was repeated twice for a
>> total of 72 trials
>> per subject. Participants had to adjust two parameters of sounds,
>> Centroid and Sound_Level_Peak,
>> for each stimulus. This is the head of my dataset (dependent variables:
>> Centroid and
>> Sound_Level_Peak; independent variables: Mat (6 levels) and Sh (2
>> levels)).
>>
>>> head(scrd)
>> Subject Mat Sh Centroid Sound_Level_Peak
>> 1 Subject1 C DS 1960.2 -20.963
>> 2 Subject1 C SN 5317.2 -42.741
>> 3 Subject1 G DS 11256.0 -16.480
>> 4 Subject1 G SN 9560.3 -19.682
>> 5 Subject1 M DS 4414.1 -33.723
>> 6 Subject1 M SN 4946.1 -23.648
>>
>>
>> Based on my understanding of the online material I found, this is the
>> procedure I used:
>>
>> idata <- data.frame(scrd$Subject)
>> mod.ok <- lm(cbind(Centroid,Sound_Level_Peak) ~ Mat*Sh,data=scrd)
>> av.ok <- Anova(mod.ok, idata=idata, idesign=~scrd$Subject)
>>
>>
>> I get the following error
>>
>> Error in check.imatrix(X.design) :
>> Terms in the intra-subject model matrix are not orthogonal.
>>
>>
>> Can anyone please tell me what is wrong in my formulas?
>>
>> Thanks in advance
>>
>> Best regards
>>
>> Angelo
>>
>>
>>
>>
>
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David Winsemius
Alameda, CA, USA
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