[FieldTrip] Statistical test and Timelockgrandaverage

[MUSTAFA YAVUZ]

Dear Umberto,

I'm guessing that your problem would be related with the analysis level you
would like to conduct. In other words, I understand that you want to
compare conditions (within subjects). I would suggest you to check the
"cfg.keepindividuals" option prior to call ft_grandaverage. Also, if the
data structure is appropriate for statistical analysis, I would recommend
to check design matrix you have.

Best wishes,
Mustafa

Cavallo, Umberto (Stud. FPN) <u.cavallo at student.maastrichtuniversity.nl>, 2
Nis 2021 Cum, 19:30 tarihinde şunu yazdı:

> Dear all,
>
> I am interested in looking differences in the pupil size between two
> conditions (and the related ERP).
>
> I am analyzing my pilot data and after the appropriate preprocessing i
> have timelocked my data through ft_timelockanalysis.
>
> Then as suggested by Fieldtrip tutorials, i have computed the grand
> average for each condition for all subject using ft_timelockgrandaverage.
>
> Finally i am using ft_statistics to test.
>
> However, the structure obtained by ft_timelockgrandaverage is not suited
> for ft_statistics (hopefully i am wrong).
>
> Thus, i ask you if to compute statistical tests through fieldtrip data
> should be maintained as they are after ft_titimelock (without computing the
> grand average across subjects) or if it is possible to use the data already
> averaged for all subjects (by ft_grandaverage).
>
> I have read the tutorials and i could not find any suggestion or example.
> Probably i was unlucky or blind, but thanks for your help anyway.
>
> Best,
>
> Umberto
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> https://doi.org/10.1371/journal.pcbi.1002202
>


-- 
*Mustafa Yavuz *

M.Sc. in Neuroscience
RA in HUBAL Neuroimaging Unit
Department of Neuroscience
İstanbul University
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