Hello AFNI experts,

I have been having trouble with a 3dMVM script. I have listed my script below:

3dMVM -prefix Fdb_Novel_Chosen_ZFAC2_all_mod -jobs 7 \
-bsVars 'ZFAC2' \
-wsVars 'Condition' \
-qVars 'ZFAC2' \
-dataTable @datatable.txt

When I run this script, I have been getting the following error:

*+ WARNING: mri_fdrize: will not process only 0 values (min=20)
++ Smallest FDR q [0 (Intercept) F] = 0
*+ WARNING: mri_fdrize: will not process only 0 values (min=20)
++ Smallest FDR q [1 ZFAC2 F] = 0
*+ WARNING: mri_fdrize: will not process only 0 values (min=20)
++ Smallest FDR q [2 Condition F] = 0
*+ WARNING: mri_fdrize: will not process only 0 values (min=20)
++ Smallest FDR q [3 ZFAC2:Condition F] = 0

Congratulations! You have got an output Fdb_Novel_Chosen_ZFAC2_all_mod+tlrc.

Warning message:
In summary.Anova.mlm(object$Anova, multivariate = FALSE) :
Singular error SSP matrix:
non-sphericity test and corrections not available

I actually ran into a similar issue a couple of years ago and Gang had advised not using any sort of mask in the analysis (link: [afni.nimh.nih.gov]). I removed the mask and that analysis worked, however I am running a similar analysis now and even when I remove the mask I get the similar error listed above. Any advice on what to try next? Thank you for your assistance!



Edited 1 time(s). Last edit at 05/14/2023 07:24PM by aloijm.