“It took Francis Galton several years to figure out that correlation and regression are not two concepts – they are different perspectives on the same concept. The general rule is straightforward but has surprising consequences: whenever the correlation between two scores is imperfect, there will be regression to the mean.”

— Daniel Kahneman, book Thinking, Fast and Slow

Source: Thinking, Fast and Slow (2011), Chapter 17, "Regression to the mean", page 181 (ISBN 9780141033570).

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Israeli-American psychologist 1934

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