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The Test Set by Posit

by Posit, PBC
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Latest episodes

  • The Bus Has to Jump 50 Feet — Greg Swinehart

    October 12, 2026 · 54 min

    Greg Swinehart mocked up the first rstudio.org, and JJ Allaire and Joe Cheng sent it back for looking too good. He's been at it ever since, from hex stickers to Shiny's new look. He and Michael Chow get into the "JJ Allaire patented heat…

  • You're the Base, AI Is the Exponent — with Tareef Kawaf

    September 21, 2026 · 1 hr 18 min

    Posit CEO Tareef Kawaf’s theory about LLMs is that they work like an exponent on whoever you already are. Greater than one and you compound. Under one and you accelerate in the wrong direction. Michael, Wes, and Hadley chat with Tareef…

  • Smuggled Gold and Untrustworthy Intuition — with Leland McInnes

    September 8, 2026 · 60 min

    Leland McInnes has spent his career building tools a lot data scientists take for granted (UMAP, HDBSCAN), and amusingly the applications of those tools keep getting stranger. On this episode of The Test Set, he tells Michael, Hadley, and…

  • Nobody Remembers Your 20 Charts — with Ruth Milligan

    August 24, 2026 · 1 hr 2 min

    Ruth Milligan has coached hundreds of conference speakers, curates TEDx Columbus, and wrote The Motivated Speaker. She's here to tell you that speaking is habitual, not natural. Michael, Wes, and Hadley get a live fifteen-second filler…

  • Let the Agent Cook — with Trevor Manz

    August 10, 2026 · 1 hr 11 min

    Trevor Manz went from measuring plant apertures by hand in a wet lab to building the notebook that lets coding agents take the wheel. The creator of anywidget and founding engineer at marimo (marimo.io/pair) popped into The Test Set to…

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  • The Answer Was Never Us — with Leilani Battle

    July 27, 2026 · 1 hr 14 min

    Leilani Battle studies how software shapes what we see and believe. The University of Washington professor and co-director of the UW Interactive Data Lab talks with Michael, Hadley, and Wes about an experiment that manipulated people using…

  • Curiosity, duty, and existential dread — with Joe Cheng

    July 13, 2026 · 1 hr 6 min

    Joe Cheng is the CTO of Posit and the creator of Shiny. He joins Michael and Hadley to talk about why he almost walked away from AI work entirely over ethics concerns and what it takes to lead a team that didn't necessarily choose you…

  • Confidently Incorrect — with Caitlin Colgrove

    June 29, 2026 · 1 hr 0 min

    Caitlin Colgrove is the CTO of Hex, the data workspace for building and sharing data projects using SQL and Python that somehow counts a Sweetgreen chef as a power user. She joins Michael, Hadley, and Isabel to talk about what AI agents…

  • The Bothness of It — with Alex Hillman

    June 15, 2026 · 1 hr 14 min

    Alex Hillman built one of America's first co-working spaces, wrote a business book in tweets, and recently handed his inbox to a Claude Code agent — not to draft emails, but to notice when a friendship is going cold. In this episode, Alex…

  • The Code Doesn't Lie — with Mike Bostock

    June 1, 2026 · 1 hr 8 min

    Mike Bostock made D3 when the browser was still a joke. He built bl.ocks when people needed somewhere to share their work. Now he's building Observable — reactive notebooks with an AI that actually looks at what it made. In this episode…

  • The Wonder-Driven Builder — with Paige Bailey

    May 18, 2026 · 46 min

    Paige Bailey is a developer relations engineering lead at Google DeepMind. She's a geophysicist-turned-AI-engineer who was once told by her professors that building open-source libraries was a waste of time. We talk about her path from…

  • Widgets Are Lego Bricks (and Other Things People Are Sleeping On) — with Vincent Warmerdam

    May 4, 2026 · 1 hr 16 min

    Vincent Warmerdam has been the first full-time hire at a startup, a spacey punster who accidentally got himself a job, a bartender at an Amsterdam comedy theater, and a Dutch bike tour guide — and he'll tell you all of it was career…

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About the show

A Posit podcast for data science junkies, anomaly hunters, and those who play outside the confidence interval. Hosted by Michael Chow, with co-hosts Wes McKinney & Hadley Wickham.