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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
[cid:1563435877.8955.9.camel@dzne.de]
Neuroscience Research Australia
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