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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

Research Assistant


Neuroscience Research Australia
Margarete Ainsworth Building
Barker Street Randwick Sydney NSW 2031 Australia
M 0411 308 769 T +61 2 9399 1725



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