AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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shruthi
May 03, 2006 10:20AM
It is a block design. The first scan had 13 subjects. Of those 13, only 9 completed the second scan.

We ran two deconvolution analyses. The first analysis was run on the first scan only (i.e., before concatenation). After this analysis, a single-sample 3dTtest was run on the deconvolution output. The second analysis was run on the concatenation of both scans. Again, after this analysis was run, we used a single sample 3dTtest on the output. The reason we feel that that the results are off, is that the two analyses produce drastically different results for conditions in the first scan.

We believe this may be due to the different number of subjects used in the two analyses. Is there a better way to compare these two scans?

Attached please find the script for the deconvolution analysis on the concatenated files.
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Subject Author Posted

Analysis Recommendation

shruthi May 01, 2006 03:24PM

Re: Analysis Recommendation

Gang Chen May 02, 2006 10:36AM

Re: Analysis Recommendation

shruthi May 03, 2006 10:20AM

Re: Analysis Recommendation

Gang Chen May 03, 2006 05:35PM

Re: Analysis Recommendation

Rutvik Desai May 02, 2006 02:54PM