Functional data analysis (e.g. scalar-on-function regression, as well as functional response types) can be implemented in Stan quite easily - and indeed automated - by using the brms package, which itself calls mgcv to prepare the various matrices. mgcv it turns out can be prodded to do various type…

Scalar-on-function regression using Stan

mike-lawrence February 26, 2018, 5:59pm 2

My experience with splines so far is that you indeed need to increase adapt_delta and max_treedepth from their defaults to get good sampling.

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