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Latest — 04 Apr 2026

Join or Die

Record linkage is the problem of identifying the same entity across two or more tables that lack a shared unique identifier. You have a name, maybe a district, maybe an age, and you need to figure out which row in table A corresponds to which row in table B. This

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Recommended Treatment

The effect of a treatment on an outcome depends on three things: the kind of treatment, the kind of person receiving it, and the context in which it is delivered. A ranking change and a button color change work through different mechanisms. A heavy user and a new user will

No Logbook, No Problem: Recovering LATE When You Can't Observe Compliance

Suppose you run a randomized experiment with imperfect compliance. You assigned treatment, measured outcomes, and now you want the LATE. The Wald estimator says divide the ITT by the compliance rate, $\pi = E[D_i \mid Z_i = 1] - E[D_i \mid Z_i = 0]$, and you'

Epic Children, Mostly Sons

Across 450 parent-child entries drawn from 32 epics and 23 civilizations, 85% of children are sons. 63% of couples have zero daughters, while only 6% have zero sons. I classified each entry by how well-documented the family actually is: mythological (gods like Zeus and Brahma), legendary (human figures with no

Regression to the Mean Model

Shuffle your XGBoost training data and you can get a different model. Not different hyperparameters or different features, just a different row order. With tree_method='hist' and multiple threads, the parallel quantile sketch that determines bin boundaries depends on how rows are chunked across workers (see stableboost

The Other Gender Gap

In 152 of 203 countries with available data, more women than men are enrolled in tertiary education. The median Gender Parity Index, the ratio of female to male gross enrollment, is 1.22. The interquartile range is [1.00, 1.35]. Only 51 countries remain below parity. The population-weighted mean

The Wrong Pairameter

In a trust game, the first mover has an endowment and chooses how much to send to the second mover. Whatever is sent gets multiplied. The second mover then decides what fraction of the multiplied amount to return. Sending more creates more total surplus. Returning more determines how that surplus

I-Ran the Numbers

How has Iran done on HDI, education, and health since 1990, relative to countries that started at roughly the same level? Iran's 1990 HDI was 0.626. To build a peer group, we take every country whose 1990 HDI falls within ±0.020 of that value. That gives

Comparative Advantage: Calibrated Pairwise Win Rates from LLM Judge Scores

Causal Judge Evaluation (CJE; Landesberg, 2025) formalizes a workflow that is already widespread in practice: score every response with a cheap LLM judge, label a small slice with a trusted oracle, learn the judge-to-oracle mapping, and evaluate at scale with calibrated uncertainty. However, calibration is only as informative as the