"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."
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Original Language: English
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Sources
Daniel Kahneman, Thinking, Fast and Slow, 2011, chapter 17, "Regression to the mean", page 181 (ISBN 9780141033570).
https://en.wikiquote.org/wiki/Francis_Galton
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Francis Galton
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