MCMC routines
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qmcmc: an R package for simple MCMC routines

Several MCMC routines are included with a common interface: Metropolis-Hastings, slice sampling, and Hamiltonian Monte Carlo. All you need to do is specify a function that computes an unnormalized density (e.g. a posterior distribution). For HMC, you’ll need to set the attribute of this value to be the gradient.

This is a similar effort to Radford Neal’s GRIMS scripts. This package is less general and flexible, but so far I have found it easier to debug and extend.