Actual Error Covariance

Famous quotes containing the words actual and/or error:

    As our actual present world ... shows itself more clearly—our world of an aristocracy materialised and null, a middle-class purblind and hideous, a lower class crude and brutal—we shall turn our eyes again, and to more purpose, upon this passionate and dauntless soldier of a forlorn hope.
    Matthew Arnold (1822–1888)

    Still we live meanly, like ants; though the fable tells us that we were long ago changed into men; like pygmies we fight with cranes; it is error upon error, and clout upon clout, and our best virtue has for its occasion a superfluous and evitable wretchedness. Our life is frittered away by detail.
    Henry David Thoreau (1817–1862)