Dear Xinyuan,
I would suggest you have a look at example 1 here:
https://en.wikibooks.org/wiki/SPM/Group_Analysis
If you follow these instructions the degrees of freedom will be as you
expect.
Best regards,
Guillaume.
On 05/02/18 13:55, Yan Xinyuan wrote:
> Dear SPM experts,
>
> I have one question when I did mixed-ANOVA analysis by using Flexible
> Factorial Design in SPM. The data was 2*2 design with "group" as
> between-subject factor and "condition" as within-subject factor. I have
> 24 subjects in group1 and 26 subjects in group2. So there were 100
> images. However, when I viewed the results, the df = 96, I am confused
> since I only have 50 participants' data. Could you please help me with
> this question?
>
> Thanks a lot!
>
> Best,
>
> Xinyuan
>
--
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG
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