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Theiss Bendixen

@theissbendixen.bsky.social
140 followers 72 following 90 posts

Data science & Bayes at Novo Nordisk | Author of "The Data Analyst's Guide to Cause and Effect" (theissbendixen.com/dag-book) | Writing a book on Bayes in drug development | Board member, giveffektivt.dk www.theissbendixen.com

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Theiss Bendixen @theissbendixen.bsky.social · 10/09/2026
"Descriptive statistics also require causal inference" So true! In the Data Analyst's Guide, we illustrate it with a fun example: a registry study on spirituality among Danes 👇 theissbendixen.com/dag-book/
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Theiss Bendixen @theissbendixen.bsky.social · 06/07/2026
This arrived just in time for Danish summer weather (rain). A few chapters in and it does not dissappoint! Remarkable mix of theory and practice, so many good points to absorb -- hope it's widely read. Thanks @statmodeling.bsky.social, @avehtari.bsky.social, @rmcelreath.bsky.social, et al.!
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Theiss Bendixen @theissbendixen.bsky.social · 03/07/2026
In short, cephalopods are an evolutionary enigma and a promising animal group on which to evaluate prominent hypotheses on the evolutionary drivers of brain size. So that's what we set out to do!
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Theiss Bendixen @theissbendixen.bsky.social · 03/07/2026
Cephalopods are also mostly short-lived, asocial and cannibalistic, they exhibit little to no parental care or pair-bonding, and usually die shortly after first reproduction. This runs counter to theories of brain size and intelligence in large-brained vertebrates.
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Theiss Bendixen @theissbendixen.bsky.social · 03/07/2026
Cephalopods are phylogenetically very distant from animals usually considered “brainy,” branching off from the vertebrates over 500 million years ago. And yet, many cephalopods possess large and complex nervous systems and exhibit flexible behaviours.
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Theiss Bendixen @theissbendixen.bsky.social · 03/07/2026
For instance, we reviewed the ecology, behavior, life-history and physiology of all ceph species for which we have brain size data, and we also built a phylogeny of these species to allow for statistical modeling of phylogenetic relationships. Phylogeny pre-print: www.biorxiv.org/content/10.1...
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Theiss Bendixen @theissbendixen.bsky.social · 03/07/2026
New research! 📚 We built the largest database to date of cephalopod species - octopuses, squids and cuttlefish - and their brains, habitats and behaviors 🐙🧠📈 What did we find?👇 Press release: www.lse.ac.uk/news/ecologi... Paper: www.sciencedirect.com/science/arti...
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Theiss Bendixen @theissbendixen.bsky.social · 07/06/2026
There's also a bonus section on "non-centered" parameterisation 🤓
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Theiss Bendixen @theissbendixen.bsky.social · 07/06/2026
For fitting the MBNMA, I use @rmcelreath.bsky.social's rethinking package, where the syntax satisfyingly mirrors the formal model.
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Theiss Bendixen @theissbendixen.bsky.social · 07/06/2026
I give a brief introduction to Bayesian model-based network meta-analysis (MBNMA) to model studies on different dose levels of the same drug and show how it can be used to inform an indirect treatment comparison between competitive drugs that have not been studied in the same trial.
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Theiss Bendixen @theissbendixen.bsky.social · 06/06/2026
It's alive! 🎉 𝗧𝗵𝗲 𝗗𝗮𝘁𝗮 𝗔𝗻𝗮𝗹𝘆𝘀𝘁'𝘀 𝗚𝘂𝗶𝗱𝗲 𝘁𝗼 𝗖𝗮𝘂𝘀𝗲 𝗮𝗻𝗱 𝗘𝗳𝗳𝗲𝗰𝘁 is out -- an introduction to causal inference in practice. The first two chapters are available for free here: theissbendixen.com/dag-book/ More below 👇
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Theiss Bendixen @theissbendixen.bsky.social · 05/06/2026
New blog post! 🚨 "From Bucher to Bayes: A Brief Introduction to Bayesian Model-Based Network Meta-Analysis for Indirect Treatment Comparisons using R" theissbendixen.com/mbnma/
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Theiss Bendixen @theissbendixen.bsky.social · 07/05/2026
In Danish 🫡 fadlforlag.dk/produkt/skep...
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Theiss Bendixen @theissbendixen.bsky.social · 07/05/2026
Here's my current tentative and very much in progress outline. Comments of all kind much appreciated!
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Theiss Bendixen @theissbendixen.bsky.social · 07/05/2026
Imagine a short book (~200 p.) introducing Bayesian statistics in the context of clinical trials and drug development. Scope would be introductory -- sort of "your first short course on Bayes". But practical enough to be applied out of the box. What would you like to see covered in such a text? 👇
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Theiss Bendixen @theissbendixen.bsky.social · 24/02/2026
Laplace, it turns out, was the real Bayesian villain, according to Fisher. From this fun paper projecteuclid.org/journals/bay...
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Theiss Bendixen @theissbendixen.bsky.social · 24/02/2026
Somewhat related to this, it turns out R.A. Fisher considered Bayes a frequentist? 🧐
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Theiss Bendixen @theissbendixen.bsky.social · 27/08/2025
Added a small section on tau
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Theiss Bendixen @theissbendixen.bsky.social · 25/08/2025
"Being Bayesian in a Frequentist World" New post on "Bayesian dynamic borrowing" in R 📚 Link 👇
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Theiss Bendixen @theissbendixen.bsky.social · 18/08/2025
Final manuscript submitted to the publisher! 📚
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