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I’d like to update the group on the status of Stan user community survey, as we have a draft to show. If anyone is interested in helping to get this over the line and/or have access to the data, please let me know on the call or on this thread.
The distribution is defined periodically for the pdf. This seems like an okay way to do it there, but that seems really sketchy for the cdf, especially with the centering as a parameter as well.
The numerical approximation is off in the 6th digit: https://github.com/stan-dev/math/pull/1753#issuecomment-603286189 . This will cause 6th-digit discontinuities in the likelihoods. It’s easy enough to doc when this happens (the approximation turns on at kappa = 50 and so that is where the switch is). Ironing this out will cost time (@pgree will need to develop some new numerics). Might be hard, might be easy. But I thought we might discuss whether this is worth it or not since I’m not sure how high demand the von_mises cdf really is. It’s not clear to what standards our current stuff is developed either.