<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">"e.g. some super-ordinate category (e.g. animate-vs-inanimate) you</span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">
<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">would like to cross-validate not across functional runs BUT across</span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">
<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">sub-ordinate stimuli categories (e.g. train on</span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">
<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">humans/reptiles/shoes/scissors to discriminate animacy and</span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">
<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">cross-validate into bugs/houses, then continue with another pair to take</span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">
<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">out)."</span><div><br></div><div>BTW, this exactly what I would like to do but I still don't figure out how to leave out the test trials from the training trials, so they don't get classified into themselves.<br>
<br><div class="gmail_quote">On Wed, Oct 24, 2012 at 5:15 PM, Jacob Itzhacki <span dir="ltr"><<a href="mailto:jitzhacki@gmail.com" target="_blank">jitzhacki@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Please do!<br><br>and thank you for all the responses :D<div><br>Don't want to come across as lazy but I'm not a master coder at all so sometimes figuring out what one line of code does can be quite the ordeal, in my case.</div>
<span class="HOEnZb"><font color="#888888">
<div><br></div><div>J</div></font></span><div class="HOEnZb"><div class="h5"><div><br><div class="gmail_quote">On Wed, Oct 24, 2012 at 3:54 PM, Yaroslav Halchenko <span dir="ltr"><<a href="mailto:debian@onerussian.com" target="_blank">debian@onerussian.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><br>
On Wed, 24 Oct 2012, MS Al-Rawi wrote:<br>
> Cross-validation is fine even in this case, you'll just need to rearrange<br>
> your data in a way to leave-a-set-of-stimuli out, instead of<br>
> leave-one-run-out. Perhaps PyMVPA has some functionality to do this. <br>
<br>
</div>now it is getting interesting -- I think you got close to what I thought<br>
the question was about: to investigate the conceptual/true effect of<br>
e.g. some super-ordinate category (e.g. animate-vs-inanimate) you<br>
would like to cross-validate not across functional runs BUT across<br>
sub-ordinate stimuli categories (e.g. train on<br>
humans/reptiles/shoes/scissors to discriminate animacy and<br>
cross-validate into bugs/houses, then continue with another pair to take<br>
out). And that is what I thought for a moment the question was<br>
about ;)<br>
<br>
This all can be (was) done with PyMVPA although would require 3-4<br>
lines of code instead of 1 to accomplish ATM. If anyone interested I<br>
could provide an example ;)... ?<br>
<div><br>
--<br>
Yaroslav O. Halchenko<br>
Postdoctoral Fellow, Department of Psychological and Brain Sciences<br>
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755<br>
Phone: <a href="tel:%2B1%20%28603%29%20646-9834" value="+16036469834" target="_blank">+1 (603) 646-9834</a> Fax: <a href="tel:%2B1%20%28603%29%20646-1419" value="+16036461419" target="_blank">+1 (603) 646-1419</a><br>
WWW: <a href="http://www.linkedin.com/in/yarik" target="_blank">http://www.linkedin.com/in/yarik</a><br>
<br>
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