[R] Repeated Measure different results to spss

[Peter Dalgaard]

mb2 wrote:
> Hi, 
>
> I have some problems with my repeated measures analysis. When I compute it
> with SPSS I get different results than with R. Probably I am doing something
> wrong in R. 
> I have two groups (1,2) both having to solve a task under two conditions
> (1,2). That is one between subject factor (group) and one within subject
> factor (task). I tried the following:
>  
>  aov(Score ~factor(Group)*factor(Task)+Error(Id)))
>  aov(Score ~factor(Group)*factor(Task))
> but it leads to different results than my spss. I definitely miss some point
> here .
>
>   
Did you mean Error(factor(Id)) ?

With that modification, things look sane. Can't vouch for SPSS...

(As a general matter, I prefer to do the factor conversions up front,
rather than inside model formulas.)


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