Hi Keith,
if you don't have any Neutral in a session, you can't do a Good-Neutral comparison. If you have multiple runs within a session, then it should be ok.
doug
On 12/07/2012 03:02 PM, Keith Yoder wrote:
Hi Doug,kjyoder@uchicago.edu <mailto:kjyoder@uchicago.edu>
I'm having a similar problem. Subjects had the opportunity to classify stimuli into one of three categories (Good, Bad, Neutral). For some subjects, one of more of the runs did not contain any stimuli that they classified as Neutral. If I want to look at a contrast that compare Good-Neutral, how should I go about doing this with FS-FAST? I'd like to keep the runs that contained neutral classifications for those subjects, but if I have to throw out those subjects to get the contrast, I guess I could.
Thanks,
Keith
--
Keith Yoder
PhD Student, Integrative Neuroscience
Social Cognitive Neuroscience Laboratory
The University of Chicago
5846 S. University Avenue, Kelly 312
Chicago, IL 60637
Phone: 574-215-9678
<mailto:greve@nmr.mgh.harvard.edu
On Thu, Mar 1, 2012 at 2:27 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote:
If you have an event type for which there is no event, then that is
definitely the problem. Let me know if it is not that.
doug
Sid Kundu wrote:
> It is attached. Finn mentioned it may be due to an event number
being
> missing from the particular subject, which could be possible in the
> analysis I am doing.
> _________________________________
> Sid Kundu
> Biomedical Engineering
> Boston University
>
>
>
> On Thu, Mar 1, 2012 at 11:15 AM, Douglas N Greve
> <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu><mailto:greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> <tel:617-724-2358 <tel:617-724-2358>> Fax: 617-726-7422
<mailto:greve@nmr.mgh.harvard.edu>>> wrote:
>
> It's probably a problem with your design. Can you send me the
> Xtmp.mat file?
> doug
>
>
> Sid Kundu wrote:
>
> Hi Doug,
>
> I created a new first level analysis along with new
contrasts
> and event numbers for a group of subjects I had previously
> done analyses on. All but one of the subjects finished
> selxavg3 without error, but one subject gave the
following error:
>
>
> Saving X matrix to
>
/home/sidkundu/freesurfer/sessions/Heading-TTP/LMV2010_N19_Heading-TTP/bold/TTP-analysis-3/Xtmp.mat
> Error using svd
> Input to SVD must not contain NaN or Inf.
>
> Error in cond (line 39)
> s = svd(A);
>
> Error in fast_selxavg3 (line 248)
> XCond = cond(XtX);
> >> ------------------------------------------
> ERROR: fast_selxavg3() failed\n
>
>
> I looked at the generated Xtmp.mat file and it shows the
> design matrix X has all zeros in 2 columns, resulting in
NaNs
> in the same columns for Xn, and corresponding NaNs in
XtX. I'm
> wondering what would cause this or why it would only
occur for
> only one subject.
>
> _________________________________
> Sid Kundu
> Biomedical Engineering
> Boston University
>
>
> --
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
<tel:617-726-7422>
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