On 6/11/2008, at 11:13 AM, Lucas Eggert wrote:
Dear Experts,
I am new to R and unfortunately cannot start with a simply statistical
analysis:
I manually determined the volume of the right and left hippocampus in
a group of meditators and in a group of controls. My data-sheet looks
as follows:
observation subject group age gender hemisphere volume
1 am04 m 25 f left 3.637
2 am04 m 25 f right 3.713
3 ao08 m 47 m left 3.715
<snip>
68 ws01 m 30 m right 5.258
69 zz03 m 35 m left 4.446
70 zz03 m 35 m 4.446 4.627
My attempt to compute the according statistic was:
aov = aov(volume~(hemisphere*group)+Error(subject/hemisphere)+
(group),input)
but with this I got the following error message:
In aov(volume ~ (hemisphere * group) + Error(subject/hemisphere) + :
Error() Modell ist singulär
I could not figure out what I did wrong. Furthermore, in the next step
I would like to use gender and age as additional covariates in the
model, but I am not sure how to do this either.
Any help would be very much appreciated!
Look at the last line of your data frame.
cheers,
Rolf Turner
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