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:dwinsem...@comcast.net]
Sent: Wednesday, November 25, 2015 12:52 PM
To: Fox, John
Cc: angelo.arc...@virgilio.it; r-help@r-project.org
Subject: Re: [R] Syntax error in using Anova (car package)
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
______________________________________________
R-help@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.
