Let me know if any of these are of interest and I can get some people together to put the proposals through.
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There’s a thread about LambertW transforms that I’d say is medium difficulty and the student could work with me and @stevebronder . Adding Lambert W Transforms to Stan?.
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Tangentially related to posteriorDB is the helpful functions repository. @bbbales2 mentions a packages/namespaces/tests structure. It depends on how we scope this on the difficulty level. It could be easy if it is just combing through discourse, google, stackoverflow, github, etc. and gathering a bunch of UDFs to put in a repo. Or hard if it is doing the namespaces and overloading. Though I think the impact of the hard route is much higher, plus they’d just have to put in a few examples with tests to show how to add to the repo. I’ll nominate @bbbales2 to oversee the project (I can help to) and have him add anyone else who maybe interested and able to help.