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Hi Michael, it is in fact invalid to compute r^2 as in the case of ordinary least square. The link below may, however, point you in the right direction: http://www.mathworks.com/support/solutions/en/data/1-CMABGO/index.html?product=ST&solution=1-CMABGO HTH Raphael Am 04.08.2011 23:15, schrieb Michael Lombardo: > Hi SPMers, > > I have a stats question that isn't necessarily related to SPM, but is > applying matlab code on some imaging data I have. I'd like to > calculate a partial r squared value or coefficient of determination > using robust regression (my analysis uses the Matlab function > robustfit). Could anyone help with a suggestion about how to do this? > I know how to do this in an ordinary least squares regression, but am > at a loss right now for what is the proper way to do this for robust > regression. > > Thanks, > > Mike