A revealing map of the world’s most and least ethnically diverse countries - The Washington Post

Ethnicity, like race, is a social construct, but it's still a construct with significant implications for the world. How people perceive ethnicity, both their own and that of others, can be tough to measure, particularly given that it's so subjective. So how do you study it?

When five economists and social scientists set out to measure ethnic diversity for a landmark 2002 paper for the Harvard Institute of Economic Research, they started by comparing data from an array of different sources: national censuses, Encyclopedia Britannica, the CIA, Minority Rights Group International and a 1998 study called "Ethnic Groups Worldwide." They looked for consistence and inconsistency in the reports to determine what data set would be most reliable and complete. Because data sources such as censuses or surveys are self-reported – in other words, people are classified how they ask to be classified – the ethnic group data reflects how people see themselves, not how they're categorized by outsiders. Those results measured 650 ethnic groups in 190 countries....

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