Aga,
What I did is: I demeaned the values in EV1 and also used D option fir
randomise (somehow I did it correct:).
Then, I am not sure if I should model my mean or not? I did it both with and
without the EV with ³1² only, results look roughly similar, what does it
change and what does it mean?
In group comparison, I dont assume the same variances.
In correlation within one group I may. Is it connected to this mean modeling?
So is this single EV all I need (yes, my values are
demeaned and I used D option) or do I need to model my mean ? And then I have 2 EVs, does it change anything with demeaning?
> Also, the third contrast "x(y)" is probably not meaningful... it's testing ifHmm, I in fact thought this is the main contrast to look at:(. So is it then
> the average of the two regression coefficients are zero.
>
the first contrast that gives me info I am looking for (how TBSS values
correlate with x, controlling for y)?