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Hi Bronwyn,

assuming that you have specified the contrasts and done the F-tests already, you will have some output from from the 'lme_mass_F' function. Let's say this output is called 'F_lhstats'. This matlab structure has a field called 'df', so your degrees of freedom will be in F_lhstats.df.

Best regards,

Kersten

On Mi, 2019-07-17 at 14:18 +1000, Bronwyn Overs wrote:

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Dear Freesurfer Mailing List,

I am trying to calculate the effect size of the main and interaction effect clusters that were significant in my vertex-wise LME analysis. For this I need the degrees of freedom for each contrast, but I am confused about how to derive this. My input sample has 218 subjects (153 with 2 time-points, 65 with 1 time-point). The effects for which I need the degrees of freedom are: 1) Main effect of years in the control group (n=112) 2) Main effect of years in the case group (n=106) 3) Main effect of group at baseline (group has two levels, 0 or 1) 4) Interaction between years and group

Any assistance you can provide would be great.

Kind regards,

Bronwyn Overs

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