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<div class="moz-cite-prefix">Dear Gabriel,<br>
<br>
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.<br>
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. <br>
Want to improve your stats? Then go for regressconfound. Find out
if there is age explains neural effects? Then go for a simple
correlation.<br>
<br>
Best,<br>
Jörn<br>
<br>
On 7/31/2013 11:56 AM, Gabriel Gonzalez Escamilla wrote:<br>
</div>
<blockquote cite="mid:2264a36963356fbe.51f8fb71@upo.es" type="cite">Thank
you all for your responses.<br>
<br>
The last problem I did wrote is now solved, see below.<br>
<br>
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? <br>
<br>
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?<br>
<br>
<br>
Many thanks in advanced,<br>
Gabriel<br>
<br>
<br>
----- Mensaje original -----<br>
De: "Stolk, A." <a class="moz-txt-link-rfc2396E" href="mailto:a.stolk@fcdonders.ru.nl"><a.stolk@fcdonders.ru.nl></a><br>
Fecha: Miércoles, 31 de Julio de 2013, 10:04 am<br>
Asunto: Re: [FieldTrip] ancova for sources analysis<br>
A: FieldTrip discussion list <a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a><br>
<br>
<span>
<p>
<style type="text/css">p { margin: 0; }</style></p>
<div style="font-family: Times New Roman; font-size: 12pt;
color: #000000"><font style="font-style: normal; font-weight:
normal; background-color: rgb(245, 248, 240); font-size:
14px;">> </font>Dear Gabriel,<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>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).<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><a class="moz-txt-link-freetext" href="http://fieldtrip.fcdonders.nl/example/how_to_incorporate_head_movements_in_meg_analysis">http://fieldtrip.fcdonders.nl/example/how_to_incorporate_head_movements_in_meg_analysis</a>?<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Yours,<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Arjen<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><br>
<hr id="zwchr">
<blockquote style="border-left:2px solid rgb(16, 16,
255);margin-left:5px;padding-left:5px;"><b><font
style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Van: </b>"Gabriel Gonzalez Escamilla"
<a class="moz-txt-link-rfc2396E" href="mailto:ggonesc@upo.es"><ggonesc@upo.es></a><br>
<b><font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Aan: </b>"fieFieldTrip discussion list"
<a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a><br>
<b><font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Verzonden: </b>Woensdag 31 juli 2013 09:05:34<br>
<b><font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Onderwerp: </b>[FieldTrip] ancova for sources
analysis<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Dear fieldtrip experts,<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>I'm wondering if it is possible to perform an ancova
or to remove the effect of a covariate in a source analysis?<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Many thanks in advanced,<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>Gabriel <br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>_______________________________________________<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font>fieldtrip mailing list<br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br>
<font style="font-style: normal; font-weight: normal;
background-color: rgb(245, 248, 240); font-size: 14px;">>
</font><a class="moz-txt-link-freetext" href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></blockquote>
<br>
</div>
</span>> _______________________________________________<br>
> fieldtrip mailing list<br>
> <a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br>
> <a class="moz-txt-link-freetext" href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br>
<br>
<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:
<a class="moz-txt-link-abbreviated" href="mailto:ggonesc@upo.es">ggonesc@upo.es</a><br
/><a class="moz-txt-link-freetext" href="http://www.upo.es/neuroaging/es/">http://www.upo.es/neuroaging/es/</a></font><br>
<br>
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<pre wrap="">_______________________________________________
fieldtrip mailing list
<a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a>
<a class="moz-txt-link-freetext" href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
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: <a class="moz-txt-link-abbreviated" href="mailto:jm.horschig@donders.ru.nl">jm.horschig@donders.ru.nl</a>
Tel: +31-(0)24-36-68493
Web: <a class="moz-txt-link-freetext" href="http://www.ru.nl/donders">http://www.ru.nl/donders</a>
Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands</pre>
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