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This means that the first PM will explain as much variance as possible, then the 2nd PM will explain any remaining variance. Without orthogonalization, the PMs compete to explain the variance in the data. Best Regards, Donald McLaren, PhD On Tue, Aug 18, 2015 at 1:52 PM, Joelle Zimmermann < [log in to unmask]> wrote: > Hi SPMers, > > I'm wondering if to orthogonalise modulations under my Parametric > Modulator? It would be great if someone could give me a bit of an > explanation of what orthogonalising modulators really means, maybe with an > example to make this concept a bit clearer. > > Thanks in advance, > Joelle >