I don't know if there's anything to deal with that builtin in lme4. But
perhaps you could transform your polar coordinates to cartesian
coordinates??

Luciano


2010/8/18 Titus von der Malsburg <malsburg@gmail.com>

> I'd like to fit mixed models for polar coordinates.  Each point
> represents the outcome of a trial in an experiment.  Items and
> subjects will be crossed random effects.  Fitting a model for the
> radius component is business as usual but I don't know how to approach
> the azimuth component.  The problem is that 2pi and 0 specify the same
> point on a circle and that the difference between 2pi-0.1 and 0.1 is
> 0.2 rather than ~6.08.  Is there a way to deal with that in lme4?
>
> R-seek didn't yield anything useful, maybe I used bad search terms.
> Thanks in advance for any advice!
>
> Best,
>  Titus
>
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