<html>
<head>
</head>
<body>
<div style="color: black;">
<div style="color: black;">
<p style="margin: 0 0 1em 0; color: black;">It's sometimes surprising how
decent performance can be even with fairly few examples; often classifying
with say, only 6 highly temporally compressed images in the training set
will do better than using a few dozen less compressed images. Similarly, I
suggest not dismissing the possibility of across-subjects classification
out of hand; it can work quite well. </p>
<p style="margin: 0 0 1em 0; color: black;">Correlation-based analyses
(which I assume you mean by RSA) may also be suitable, depending on your
hypotheses.</p>
<p style="margin: 0 0 1em 0; color: black;">Jo</p>
</div>
<div style="color: black;">
<p
style="color: black; font-size: 10pt; font-family: Arial, sans-serif; margin: 10pt 0;">On
May 30, 2016 4:31:50 PM Richard Dinga <dinga92@gmail.com> wrote:</p>
<blockquote type="cite" class="gmail_quote"
style="margin: 0 0 0 0.75ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div
dir="ltr"><div><div>> Do you have to do
within-subjects classification, or could you cross-validate on the
subjects? (I guess that is option 4.) That would also simplify the
permutation testing.<br><br></div>yes, I am interested in within subject
pattern of activities, possibly RSA<br><br>> If you need to stick to
cross-validation within people, I'd prefer splitting the dataset into two
halves (first half of the run, second half of the run, which I assume is
your option 1) over option 2: adding more cross-validation folds just
compounds the potential confounds, and there's nothing special about 10
folds.<br><br></div>10 folds has almost twice as many training points,
therefore I guess it will have higher accuracy, and with split half, there
still wouldn't be much to permute<br><br><div><div><div
class="gmail_extra"><br></div></div></div></div>
_______________________________________________<br>
Pkg-ExpPsy-PyMVPA mailing list<br>
<a class="aqm-autolink aqm-autowrap"
href="mailto:Pkg-ExpPsy-PyMVPA%40lists.alioth.debian.org">Pkg-ExpPsy-PyMVPA@lists.alioth.debian.org</a><br>
<a class="aqm-autolink aqm-autowrap"
href="http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa">http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa</a><br>
</blockquote>
</div>
</div>
</body>
</html>