Collinearity issue with bandpass

AFNI Message Board
1

Dear AFNI users,

I get a 3dDeconvolve WARNING message when I used the ‘-ortvec bandpass_rall.1D bandpass’ option:


*+ WARNING: !! in Signal+Baseline matrix:
 * Largest singular value=2.66744
 * 3 singular values are less than cutoff=2.66744e-07
 * Implies strong collinearity in the matrix columns! 
*+ WARNING: !! in Baseline-only matrix:
 * Largest singular value=2.66744
 * 3 singular values are less than cutoff=2.66744e-07
 * Implies strong collinearity in the matrix columns!

Note that the 3dDeconvolve command is running well without the bandpass filter option. I don’t understand what the problem is.
Do you think I could use the -GOFORIT option run it until the end?

Many thanks for any answer.

Carole

2

Hi Carole,

What does out.ss_review* say about censoring and degrees of freedom?

It is very common for the combination of censoring and bandpassing to
make data unusable.

  • rick
3

Sorry, I do not have any out.ss_review* output files…