Hi Stan community
I was wondering how one should treat posterior samples of a stanfit object regarding the autocorrelation of the samples.
Say we sample 10k samples after 10k warmup.
ESS, Rhat are okay / good.
Yet, when we look at the ACF of saying a scale parameter, ACF goes to 0 around the 15th observation for all 4 chains.
Should we then thin the series to every 15th value to have proper inferences and predictions?
Sorry for this likely very basic question… I could not find a satisfying answer with a couple of google searches…