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quadratic mean

Definition from Dictionary, a free dictionary
The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is commonly understood. Indeed the world is ruled by little else. Practical men, who believe themselves to be quite exempt from any intellectual influence, are usually the slaves of some defunct economist.
John Maynard Keynes
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English

Etymology

Quadratic in the phrase refers to the squaring on the terms.

Noun

quadratic mean

  1. (mathematics) A type of average, calculated as the square root of the mean of the squares, ie. <math>Q = \sqrt { x_1^2 + x_2^2 + ... + x_n^2 \over n }</math>.

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