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Hi Florencia, Very sorry for the delay. I've just answered in the other thread... All the best, Anderson On Mon, 30 Sep 2019 at 11:20, Florencia Jacobacci < [log in to unmask]> wrote: > Dear Anderson and FSL users, > > I am trying to run an analysis to relate changes in DTI with BOLD (BOLD > and DTI images arein the same space and have the same spatial resolution). > Thus, I have used the BOLD image as voxelwise EV in PALM. I have tried two > options and both present problems: > > 1) Use BOLD as voxelwise EV for DWI changes with FWE correction across > contrasts and modalities and NPC across modalities > *palm -i DTI_4D_S1-S2.nii -i DTI_4D_S3-S2.nii -evperdat 4d_BOLD.nii -npc > -npcmod -corrcon -corrmod -n 500 -T -Tnpc -logp -accel tail -concordant > -nouncorrected -o $output -m $mask* > > In this case, I am getting the following warning: > Rank deficient = 0 > > I have tried adding -pmethodr Ridgway as partition method used in the > regression to solve the rank deficiency, as I had seen suggested in a > thread in this forum, but it didn't work for me. > > 2) Use BOLD as voxelwise EV for DWI changes with FWE correction across > contrasts and modalities and design. The design I used is all ones in EV1 > for the mean and all ones in EV2 for the voxelwise EV. The contrasts I used > are [0 1] and [0 -1] to test for positive and negative associations. > > *palm -i DTI_4D_S1-S2.nii -i DTI_4D_S3-S2.nii -evperdat 4d_BOLD.nii 2 -d > Design_voxelwiseEV.mat -t Design_voxelwiseEV.con -npc -npcmod -corrcon > -corrmod -n 500 -T -Tnpc -logp -accel tail -nouncorrected -o $output -m > $mask* > > In this case, I am getting a warning saying Matrix is singular to working > precision. > > What could be the problem here? > > Thanks for any advice you can give me to solve this. > Regards, > Florencia. > > > -- > Ing. Florencia Jacobacci. > PhD student / Becaria doctoral > Instituto de Fisiología y Biofísica (IFIBIO) - Bernardo Houssay > Laboratorio de Fisiología de la Acción, Facultad de Medicina > Universidad de Buenos Aires > Paraguay 2155, C.A.B.A.(C1121ABG), Argentina > ☎ (+5411) 5285-3304 > > http://www.physiologyofactionlab.info/en/about-the-lab/ > https://ar.linkedin.com/in/florenciajacobacci/en > > ------------------------------ > > To unsubscribe from the FSL list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1 > ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1