Am 20.04.2016 um 15:02 schrieb JOSE FRANCISCO PERLES RIBES: Hi, in the future it would be helpful if you could add some more details and references, instead of letting others do the work. For example, it turns out it's "Diks" not Dicks, and I can only speculate why you spell it that way. Also I found this interesting: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.465.3805&rep... Having said that, sorry no I'm not aware of any implementation for that. But BTW, these tests also seem to be non-parametric, not only non-linear. Doing it non-linearly but parametric should be easier I think, but of course it depends whether that would be good enough for you. cheers, sven