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Sean Pinkney

@spinkney.bsky.social

I mostly post about probabilistic programming stuff, statistics, and R/Julia/Python (in that order). I'm a volunteer Stan developer and citizen scientist (papers on arxiv). Currently my day job is doing marketing analytics.

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Sean Pinkney@spinkney.bsky.social · last yr.

Stan 2.37 will be out sometime next week. I helped get the updated simplex parameterization and sum-to-zero matrix (both rows and columns sum to zero). We found the new simplex parameterization to be much better in the extremes of the simplex and across very small alpha values of the dirichlet 1/

Sean Pinkney@spinkney.bsky.social · last yr.

Fellow probabilistic programmers I came up with a parameterization for a Cholesky factor of correlation matrices that looks good. I'm asking to test and see if it works well for you discourse.mc-stan.org/t/updated-ch... #rstats #statistics #bayesian

Updated cholesky corr parameterization testing

Hi everyone, I’m asking if people could test out this parameterization of the Cholesky factor of correlation matrices? From my tests on a macpro m1, it looks to be much faster and I can easily sample...

discourse.mc-stan.org

Sean Pinkney@spinkney.bsky.social · 2y ago

I will only be impressed by you if you solve a long standing mathematical conjecture and win the Tour de France within 2 years of each other. Otherwise, what are you even doing?

Sean Pinkney@spinkney.bsky.social · 2y ago

Tried zyn and that shit was so dysphoric. I don't smoke or take nicotine so probably too much. I had 1 slim pouch (2/4 strength) for 5 mins and then 10 mins later another pouch for 15 min. Initially I felt lightheaded, then I started sweating, felt nauseous, and couldn't wait for the effect to end

Sean Pinkney@spinkney.bsky.social · 2y ago

I have a 2017 MacBook pro and work supplied me with a m1max 32 GB about 3 years ago. I'm thinking I'll buy two or three mac minis and use them as a cluster. My son wants to start a twitch/yt stream and I think I can set up game screen capture better this way too. Any thoughts?

Sean Pinkney@spinkney.bsky.social · 2y ago

I'm going to have time to do 1-2 contributions for the summer 25 release. Here's my list to choose from, what is most interesting to you? - adding lower/upper bounds to ordered vectors (removing positive ordered since it's achieved by lb=0)

Sean Pinkney@spinkney.bsky.social · 2y ago

A new release of Stan is coming discourse.mc-stan.org/t/cmdstan-st.... Highlights: New constraints for stochastic matrices and zero-sum vectors Easier user-defined constraints Improved diagnostics New distribution, beta_negative_binomial

Sean Pinkney@spinkney.bsky.social · 2y ago

A new release of Stan is coming discourse.mc-stan.org/t/cmdstan-st.... Highlights: New constraints for stochastic matrices and zero-sum vectors Easier user-defined constraints Improved diagnostics New distribution, beta_negative_binomial

CmdStan & Stan 2.36 release candidate

I am happy to announce that the latest release candidates of CmdStan and Stan are now available on Github! This release cycle brings new constrained types, improved diagnostics, and a new distributio...

discourse.mc-stan.org