[R] ANOVA of a sort
jorismeys at gmail.com
Thu Jun 10 14:46:58 CEST 2010
This is a typical problem we give as a homework to students. If you
can't solve this yourself, you really need to brush up your
statistical knowledge or look for a statistician close by to cooperate
Take a look at these :
If you read through the documentation, you should get a fair idea of
whether or not your data is suited to use a repeated measures anova,
and if so, how you'd have to specify your model in R.
Good luck with it.
On Thu, Jun 10, 2010 at 1:17 AM, Claus O'Rourke <claus.orourke at gmail.com> wrote:
> Dear R Help,
> I have a general question - I know this is the R list, but I hope
> someone can help me out a little as I've always found the help here to
> be absolutely fantastic.
> I have run a psychological study where participants are given multiple
> stimuli and their responses to those stimuli are measured on the same
> numerical scale, i.e., the data is something like
> Participant Stimulus Measurement
> p1 s`1 5
> p1 s`2 6.1
> p1 s`3 7
> p2 s`1 4.8
> p2 s`2 6
> p2 s`3 6.5
> p3 s`1 4
> p3 s`2 7
> p3 s`3 6
> I would like to be able to measure the between participant variability
> for my data - i.e., determine whether measurements are relatively
> homogeneous across participants and whether there are very strange
> outliers (i.e., participants who maybe gave random or purposefully
> incorrect answers).
> Can anyone point me towards the correct type of tests for quantifying
> this? I have read that a repeated measure ANOVA might be a starting
> Many many thanks for any help you can give me!
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control
tel : +32 9 264 59 87
Joris.Meys at Ugent.be
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