I’m attempting to use 3dTcorrelate to obtain Spearman correlation values for the relationship between parents’ and children’s responses during a task condition. I first used 3dTcat to put each subject’s values into sample datasets (‘parent_sample_17dyads+tlrc’ and ‘youth_sample_17dyads+tlrc’). I then ran the following command:
3dTcorrelate -spearman -polort -1 -prefix parent_youth_spearman_corr_3dtcorr1d_17dyads parent_sample_17dyads+tlrc youth_sample_17dyads+tlrc
The results seem to make sense, but the only problem is the output does not provide p-values. It just says “[N/A]” below the slider. This doesn’t happen when I use the default Pearson method. I tried using the ‘-automask’ option, but for some reason that doesn’t seem to work on my data. It actually tends to mask out the brain.
Is significance testing not supported for Spearman values with 3dTcorrelate?