Articles
Each article takes one link between places and tests it every way the data allows. Some links hold up. Some turn out to be about something else. Either way, the article shows how to tell. None of them shows that one thing changes another, only that two things go together.
Around the world
Countries where people have a say collect more tax
At every income level and in every region, countries with more voice for citizens collect more of their income in tax.
The puzzle of women managers and homicide
Countries with more women in management have more homicide. Most of that turns out to be one region.
Where more women work, people drink more
A strong link between women's work and alcohol, and the third factor that explains almost all of it.
Across the United States
In tight-knit counties, fewer people move in or out
Where people's friends know each other, fewer residents leave and fewer newcomers arrive, in almost every state.
Friendships across income lines, and how far poor children climb
Children from poor families do better as adults in counties where friendships cross income lines.
US Murder (Homicide) Rate: What Drives It?
Which county conditions still go with higher homicide rates once poverty, income and density are compared fairly.
Where the rich move
Every public source on high earners and millionaires moving between states, side by side.
Do states lose people after income tax rises?
Every state with an income tax, year by year, each compared with its own past.
State top income tax rates since 1995
Every change to every state's top rate, from state law, with what migration and jobs did around it.
Local income taxes
Every US city, county and school district that taxes income, and what each has collected since 1967.