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Is there a balance to be struck between simple hierarchical models and more complex hierarchical models that augment the simple frameworks with more modeled interactions when analyzing real data?

Kiran Gauthier writes: After attending your talk at the University of Minnesota, I wanted to ask a follow up regarding the structure of hierarchical / multilevel models but we ran out of time. Do you have any insight on the thought that probabilistic programming languages are so flexible, and the Bayesian inference algorithms so fast, that there is...

Sun May 26, 2024 18:48
Break it to grok it: The best way to understand how a method works is go construct scenarios where it fails

Someone who is working on a statistical problem in political science writes: I came across an algorithm . . . [follows with description of some classical and Bayesian approaches that use this algorithm] . . . Now the results I have gotten from these models seem very accurate. Is there a theoretical basis for why this model should or shouldn’t work?...

Sat May 25, 2024 18:33
HMC fails when you initialize at the mode

Nawaf Bou-Rabee was telling me and Chirag Modi that a high-dimensional normal initialized at the mode would be a disaster. I was skeptical as I’d never seen this behavior. So I dashed back to the computer and ran some simulations. Summary: Nawaf’s right! Simulation results I defined a 10,000-dimensional standard normal in Stan and used CmdStanPy...

Sat May 25, 2024 02:31
Deadwood

I was thinking the other day about tenured faculty who don’t do their job or who do the absolute minimum: I’m talking about professors who never show up to work, do no research, and whose teaching is at the absolute minimum level of quality. Such people can actually be a negative in that they give students a substandard level of education and can...

Fri May 24, 2024 18:24
GPT today: Buffon’s Needle in Python with plotting (and some jokes)

Werner Krauth is visiting NYU’s Simons Center for Physics from ENS in Paris. He’s a physicist and the author of the 2006 book Statistical Mechanics: Algorithms and Computations. And he’s stopping by our reading group Fridays, where I learned about his most peculiar approach to plotting. He coded it in Postscript and ran simulations on the printer....

Fri May 24, 2024 00:23
Another opportunity in MLB for Stan users: the Phillies are hiring

The Philadelphia Phillies reached out to let us know they are looking to hire a “Lead or Senior Quantitative Analyst, Player Evaluation” for their Baseball Operations Department. And they’re particularly interested in people who have experience with probabilistic programming languages like Stan and PyMC! For more details check out the job posting.  

Thu May 23, 2024 21:34

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