Dear brms and cmdstanr users,
A brms program is running on my Mac now. I use cmdstanr through backend of brms. The sampling is running properly but percentage of the progress is presented in very small steps like:
Chain 4 Iteration: 20800 / 50000 [ 41%] (Sampling)
Chain 4 Iteration: 20900 / 50000 [ 41%] (Sampling)
Can I change the scale of the progress percentage presentation? I’m happy if it is 10%-step.
This is so trivial but so many lines in console is inconvenient…
Thank you very much.
macOS Catalina version 10.15.7
cmdstanr version 0.4.0
brms version 2.16.1.
Rstudio Version 1.4.1106
Use for example
refresh=5000 to print progress every 5000 iterations.
For what it’s worth, it’s very rare that you would need 50000 iterations from Stan.
I missed it in the manual… Thank you very much!
I’m a beginner of Bayesian statistics and some texts I found said relatively large size of iterations is needed to calculate Bayes factor. Probably 10000-iterations is enough but some studies employed 20000 iterations. So I just think 50000-iteration is surely enough for any case. But as you commented, it seems weird-level of iterations. I should reduce it to around 15000. Thank you very much for your comment!
The Bayesian text that you have read may have used simpler MCMC algorithms like Metropolis-Hastings. Then the samples have a lot of autocorrelation and it is understandable that a lot of iterations are needed. With Stan the effective sample size is higher so less iterations is needed, I think this is what @jsocolar meant.
I did not care about algorithms in texts and previous studies. Seems I need check it to understand properly the number of iterations. Thank you very much for your comment. I really appreciate it.