Estimated Value
In statistics, the hat is used to denote an estimator or an estimated value, as opposed to its theoretical counterpart. For example, in the context of errors and residuals, the "hat" over the letter ε indicates an observable estimate (the residuals) of an unobservable quantity called ε (the statistical errors).
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Famous quotes containing the word estimated:
“... many of the so-called grievances of women are false. No man ever unfairly discriminated against me. If one tried to, I ... was equal to the emergency, and such experience really added a great deal to the zest of life.... women, as a habit, over- estimated their ability, and ... they were too untrained even to appreciate the magnitude of their undertaking.”
—Alice Foote MacDougall (1867–1945)
“The glory of a great man ought always to be estimated by the means used to acquire it.”
—François, Duc De La Rochefoucauld (1613–1680)