Bradley–Terry Models and Pairwise Comparisons in brms Whew—it's been a minute since I've written a blog post. But I recently published a paper that seemed like it would lend itself nicely to a new post, so here we are! Before I move on I'll note that this is an abbreviated version of a longer post from my personal blog. You can read the full post here. If you really want to dig into the code and the resulting figures I'd suggest going over there to see it.

Bradley–Terry Models and Pairwise Comparisons in brms

Whew—it's been a minute since I've written a blog post. But I recently published a paper that seemed like it would lend itself nicely to a new post, so here we are! Before I move on I'll note that this is an abbreviated version of a longer post…

@mdigiuseppe.bsky.social and I have a new piece out in @poqjournal.bsky.social where we use LLMs and Bayes/brms to estimate pairwise comparisons and latent scores.

Two map graphs show the state of liberal democracy according to the V-Dem Liberal Democracy index for 2025 and 2024. The higher the score (or darker blue), the more democratic the country. Lower scores (or dark red) mean less democratic. While North and South America, Western Europe and Oceania are mostly in the blue, most parts of Asia and Africa are in the red in 2025. In comparison to the map for 2024, the map graph for 2025 shows democratic backsliding in some traditionally stable democracies in Western Europe and North America, in particular the USA, United Kingdom and Italy.

📢 Out Now! V-Dem Dataset v16 & the V-Dem Institute Democracy Report 2026
💾 The V-Dem Dataset: v-dem.net/data/the-v-d...
📰 The Report "Unraveling The Democratic Era?”: v-dem.net/publications...
📈 Explore the new data with the V-Dem Graphing tools: v-dem.net/graphing/gra...

#PoliSky #PoliSciSky
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The Quantitative Peace Quantitative and formal analysis of international relations, comparative politics, and American politics.

Slowly rebuilding the website to relaunch quantitativepeace.com, stay tuned!