afni.nimh.nih.gov

Dear all

in the help file of 3ddot, which should be calculating the (spatial) correlation coefficient between two bricks, I find the option "-demean", which leaves me confused. Doesn't the correlation coefficient formula already contain a demeaning operation? The correlation coefficient value should be mean- (and variance-) independent, as far as I remember.....

thanks in advance for any clarification

giuseppe