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I'm not sure if r squared is a meaningful measure with robust regression. See for example the following posts, which suggest to me that it is not: http://www.stata.com/statalist/archive/2004-05/msg00107.html https://stat.ethz.ch/pipermail/r-help/2008-November/179773.html cheers, -MH On Thu, 2011-08-04 at 22:17 +0100, Michael Lombardo wrote: > Hi FSLers, > > I have a stats question that isn't necessarily related to things > implemented by FSL, but is about 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 current > analysis uses the Matlab function robustfit to do the robust > regression). 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