[FieldTrip] ancova for sources analysis
"Jörn M. Horschig"
jm.horschig at donders.ru.nl
Thu Aug 1 12:37:08 CEST 2013
Dear Gabriel,
if you have a .stat field, you did already run statistics on your data.
I wouldn't regress anything out of e.g. t-values. Rather, the idea is to
regress out confounding factors before doing statistics, so that you
reduce variance across trials and subsequently maximize sensitivity of
your statistical test. I could really advise you to read the paper I
suggested, the rationale is explained there.
Moreover, if you are interested in a covariate like 'age', a simple
correlational analysis might make more sense. As stated, the idea of
regressconfound is to explain and remove variance across observations,
but depending on what you want, a correlation might make more sense.
Want to improve your stats? Then go for regressconfound. Find out if
there is age explains neural effects? Then go for a simple correlation.
Best,
Jörn
On 7/31/2013 11:56 AM, Gabriel Gonzalez Escamilla wrote:
> Thank you all for your responses.
>
> The last problem I did wrote is now solved, see below.
>
> I had a field called 'stat' instead of the 'pow', I'm guessing this
> field was set before, so, now i'm using this field as if it was the
> 'pow' I needed and it's working, Is that OK?
>
> Now it takes me to the next question, my data has the avg field, and
> it says that will update the descriptives but that the 'method' is
> missing, is this update necessary? or can I just skeep it?
>
>
> Many thanks in advanced,
> Gabriel
>
>
> ----- Mensaje original -----
> De: "Stolk, A." <a.stolk at fcdonders.ru.nl>
> Fecha: Miércoles, 31 de Julio de 2013, 10:04 am
> Asunto: Re: [FieldTrip] ancova for sources analysis
> A: FieldTrip discussion list <fieldtrip at science.ru.nl>
>
> >Dear Gabriel,
> >
> > This page demonstrates how to remove contributions to the data
> originating from head movement, but one could as well follow the same
> principle for any other type of covariate (e.g. eye movement related
> activity).
> >
> > http://fieldtrip.fcdonders.nl/example/how_to_incorporate_head_movements_in_meg_analysis?
> >
> > Yours,
> > Arjen
> >
> ------------------------------------------------------------------------
>
> *> Van: *"Gabriel Gonzalez Escamilla" <ggonesc at upo.es>
> *> Aan: *"fieFieldTrip discussion list" <fieldtrip at science.ru.nl>
> *> Verzonden: *Woensdag 31 juli 2013 09:05:34
> *> Onderwerp: *[FieldTrip] ancova for sources analysis
> >
> > Dear fieldtrip experts,
> >
> > I'm wondering if it is possible to perform an ancova or to remove
> the effect of a covariate in a source analysis?
> >
> > Many thanks in advanced,
> > Gabriel
> > _______________________________________________
> > fieldtrip mailing list
> > fieldtrip at donders.ru.nl
> > http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
>
> > _______________________________________________
> > fieldtrip mailing list
> > fieldtrip at donders.ru.nl
> > http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
> <font size="3">--------------------------<br />PhD. student Gabriel
> González-Escamilla<br />Laboratory of Functional Neuroscience<br
> />Department of Physiology, Anatomy, and Cell Biology<br />University
> Pablo de Olavide<br />Ctra. de Utrera, Km.1<br />41013 - Seville<br
> />- Spain -<br /><br />Email: ggonesc at upo.es<br
> />http://www.upo.es/neuroaging/es/</font>
>
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
--
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
FieldTrip Development Team
P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands
Contact:
E-Mail: jm.horschig at donders.ru.nl
Tel: +31-(0)24-36-68493
Web: http://www.ru.nl/donders
Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands
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