[R] nonparametric mixed effect model

[Fons van der Plas]

Hi all,

I'd like to compare species richness patterns of two groups with paired
observations with an extra continuous fixed effect as a covariate. Normally
I would use a standard general mixed effect model for such data, with one
group variable and a continuous variable as fixed effects, plus a random
effect for the paired observations. However, after making such a model with
the lme function, I saw that the residuals of my model were not normally
distributed and transforming them to a normal distribution does not seem to
be possible. Therefore I need a nonparametric equivalent of the lme function
to build a nonparametric mixed effect model. Does anyone know how I can do
this? Any help would be very appreciated!
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