Quote: deviation towards the mean: consider variables X and Y with the same distribution; the extremes of X will be less extreme in Y

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consider two variables X and Y which have … [e.g., scores of a large group of children on two equivalent aptitude tests]. If one selects individuals whose average X score deviates from … deviate from the mean of Y by less … was first documented by Galton more than 100 … [p. 1127] The failure to recognize the import of … [For example, experienced flight instructors] noted that praise for an exceptionally smooth … while harsh criticism after a rough landing is … [Regression toward the mean is a significant, but ignored, factor.]   Google-1   Google-2

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