HI, Maria,
I am not familiar with PET, but ANCOVA is usually applied to control
co-variates like age, education etc.
You may find more information in SPM8 manual.
Good luck!
Gao
On 17 April 2012 16:15, Maria Serra <[log in to unmask]> wrote:
> Dear SPMers,
>
> I'm performing a t-test with PET images for repeated mesures (n=7)
> (neuroestimulator 'ON' and 'OFF').
>
> What is the function of 'ANCOVA'? How I need to put the contrasts If I set
> the ANCOVA option to 'yes'?
>
> Likewise, which are the best options for 'global calculation' and 'global
> normalisation'?
>
> If there is anywhere where I could find that information would be so helpful
> to me.
>
> Thank you in advance,
>
> --
> Maria Serra
>
> PIC (Port d'Informació Científica)
> Campus UAB, Edifici D
> E-08193 Bellaterra, Barcelona
> Telf. +34 93 586 8232
> www.pic.es
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