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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Gang Chen
January 07, 2004 02:26PM
OK, it means that you have multicollinearity issue with some combinations of minlag and maxlag, which makes the linear system insolvable with the corresponding design matrix.

Thhis is some intrinsic problem about the experiment design in which there is not enough randomization of the stimuli. With the data already collected, there is not much you could do about it unless you experiment with various minlag and maxlag as you have already tried.

This unfortunate situation reiterates the importance of analyzing experimental design before real scanning, e.g., running RSFgen and/or 3dDeconvolve with '-nodata' option.

Gang
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Subject Author Posted

3dDeconvolve /minlag/maxlag

teodora January 07, 2004 11:51AM

Re: 3dDeconvolve /minlag/maxlag

Gang Chen January 07, 2004 12:44PM

Re: 3dDeconvolve /minlag/maxlag

teodora January 07, 2004 01:17PM

Re: 3dDeconvolve /minlag/maxlag

Gang Chen January 07, 2004 01:24PM

Re: 3dDeconvolve /minlag/maxlag

teodora January 07, 2004 01:49PM

Re: 3dDeconvolve /minlag/maxlag

Gang Chen January 07, 2004 02:26PM

Re: 3dDeconvolve /minlag/maxlag

Jim Eliassen January 07, 2004 05:38PM

Re: 3dDeconvolve /minlag/maxlag

teodora January 08, 2004 08:32AM