[R] Syntax error in using Anova (car package)

[Bettina Gruen]

Dear John,

thanks for the hint. This issue should be corrected now.

Best,
Bettina

On 11/25/2015 07:42 PM, Fox, John wrote:
> Dear David,
>
> Thanks for the correction.
>
> I copied the link from the R Journal website at <https://journal.r-project.org/archive/RJournal.bib>, so I guess they need to fix their .bib file.
>
> I'm cc'ing the R Journal editor.
>
> Best,
>   John
>
>
>
>> -----Original Message-----
>> From: David Winsemius [mailto:dwinsemius at comcast.net]
>> Sent: Wednesday, November 25, 2015 12:52 PM
>> To: Fox, John
>> Cc: angelo.arcadi at virgilio.it; r-help at r-project.org
>> Subject: Re: [R] Syntax error in using Anova (car package)
>>
>>
>>> On Nov 25, 2015, at 9:23 AM, Fox, John <jfox at 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.arcadi at virgilio.it [mailto:angelo.arcadi at virgilio.it]
>>>> Sent: Wednesday, November 25, 2015 11:30 AM
>>>> To: r-help at 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
>>>>
>>>>
>>>>
>>>>
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>>> PLEASE do read the posting guide http://www.R-project.org/posting-
>> guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>
>> David Winsemius
>> Alameda, CA, USA
>
>
>