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Dear Fsl people I'm using TBSS to see if FA values correlate to a behavioural measures while controlling for a confound variable. I've already made a regression with 2 EV's (both demeaned) and used the -D option. Mat file: /NumWaves 2 /NumPoints 102 /PPheights 9.00000e-01 2.00000e+02 /Matrix EV1 EV2 2.6 -8 2 4 -1 2 1 3 .. .. Contrasts 1 0 (positive effect of EV1 controlled for EV2?) -1 0 (negative effect of EV1 controlled for EV2?) Is this the right way to control for EV2? My results seemed to get more significant, which I found strange... Or is there a possibility to do a partial correlation? Any help would be appreciated! Kind regards Isabelle