Demographics & Society
Population change, migration, family structure, and the social fabric — the long-run shifts beneath the headlines.
11 pieces
AppWorldlines — The World in Numbers
A cross-country indicators explorer — 85 measures of development, democracy, belief, and wellbeing across 217 countries (1750–2025), with country profiles, rankings, and peer benchmarking.
BlogAmerica Ran Out of Common Names
A century of Social Security records shows the quiet collapse of the common first name — and that name fads now burn out twice as fast as they used to.
BlogThe Rhythm of a City
8.6 million reported incidents over 25 years give Chicago crime a legible pulse: hourly, weekly, seasonal — and three distinct eras.
BlogWho Gets Remembered
4.4 million Wikidata biographies, sliced by birth cohort, occupation and gender: a measurement of memory itself.
BlogFifty Years of American Evenings
Since 1974 the GSS has asked the same four questions: how often do you spend an evening with relatives, with friends, with neighbors — or at a bar? The answers trace a half-century in which company grew rarer, screens grew brighter, and…
TeachingLottery ZIP Psychographics: How Neighborhoods Play
Segment active NYC ZIP codes from NY Lottery behavior signals, then interpret the PCA/factor score space with borough, income, retailer availability, and product-mix profiles.
BlogThe Eight Americas
A k-means clustering of 81,000 census tracts sorts the country into eight kinds of neighborhood — and a child's whole life-course dashboard shifts with the label.
TeachingThe Shape of Development — PCA, Factor Analysis & Clustering
Twelve numbers describe a country. It turns out you need barely one. A working note on principal components, factors, and clusters.
BlogThe Vanishing Cradle
America's birth count fell into the pandemic and never fully came back — and the baby bust was not shared evenly across the deprivation map.
ZIP psychographic baseline parquet
ZIP-level baseline psychographic or latent-factor data stored as parquet.
County demographics parquet
County-level demographic parquet dataset paired with a local county demographics JSON file.