Release of CmdStan and Stan 2.28.2

With the help of our users, we have identified and fixed two issues with the latest release which is why we just released Stan and CmdStan 2.28.2. The issues that were identified and fixed for this patch release are given below. We would like to thank Stan forums users zcai, rfc and abeeisnotabug for reporting … Continue reading Release of CmdStan and Stan 2.28.2

Release of CmdStan 2.28.1

We are very happy to announce that the 2.28.1 release of CmdStan is now available on Github! As usual, the release of CmdStan 2.28.1 is accompanied with the new releases of Stan Math, core Stan and Stanc3. There was a release of 2.28.0 a few days ago, but we quickly identified a few bugs that were since squashed and … Continue reading Release of CmdStan 2.28.1

Release of CmdStan 2.27.0

We are very happy to announce that the 2.27.0 release of CmdStan is now available on Github! As usual, the release of CmdStan 2.27.0 is accompanied with the new releases of Stan Math, core Stan and Stanc3. The release of Stan 2.27 is also accompanied by the release of pystan 3.1! This new release brings … Continue reading Release of CmdStan 2.27.0

Release of CmdStan 2.26.1

With the help of our users we have identified a few issues with the latest release which is why we have just released CmdStan 2.26.1. The issues that were identified and fixed for this patch release are given below. We would like to thank Github users cdriveraus, grburgess, rmcminds and spinkney for reporting the issues … Continue reading Release of CmdStan 2.26.1

Setting Up Rstudio and Cmdstanr on AWS EC2

I recently had the joy of setting up my environment on AWS EC2 and I wanted to put this out there for anyone who just wants to get started as fast as possible. I'll assume that you set your EC2 instance up already. Let me note that you should add some type of persistent storage … Continue reading Setting Up Rstudio and Cmdstanr on AWS EC2

Release of CmdStan 2.26.0

We are very happy to announce that the 2.26.0 release of CmdStan is now available on Github! As usual, the release of CmdStan 2.26.0 is accompanied with the new releases of Stan Math, core Stan and Stanc3. This new release brings bug fixes, improvements for robustness, a few new functions, performance improvements and profiling. Contributors … Continue reading Release of CmdStan 2.26.0

Stan needs your help: Writing and fixing documentation

Are you using Stan for your everyday work, study or fun? Have you wondered how you could help or give back to the open source project? Here is one opportunity if you can spare an hour or two. You are most likely aware of the Stan's User Guide, Reference Manual and Functions Reference and how … Continue reading Stan needs your help: Writing and fixing documentation

Thinking About Automatic Differentiation in Fun New Ways

Recently Tadej Ciglarič came up with a new pattern to do automatic differentiation in Stan Math's C++ library and I thought it would be nice to have a little blog post talking about it. For the purposes of blogging I'm going to be simplifying a few things, but the main take here is that it's … Continue reading Thinking About Automatic Differentiation in Fun New Ways

Correlation Cats Part I

Herding cats is hard. These cowboys herding cats can attest. Have you ever tried to herd elements of correlation matrices? Stan implements a lot of nice functionality to make your correlated life easier and recommends the LKJ correlation distribution and correlation matrix transform but this 3 part post is about herding cats not shooting fish in a barrel. This post is about rolling … Continue reading Correlation Cats Part I

Stan 2.25 release!

We are happy to announce the release of Stan 2.25 is now available! This release cycle is mostly quality of life features for Stan users and developers. How to install? The 2.25 Cmdstan release is here. Download the tar.gz file, extract it and use it the way you use any Cmdstan release. The updated 2.25 … Continue reading Stan 2.25 release!