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15.5.175 erf


Returns the value of the error function at ordinate x, which is the integral of 2*exp(-y^2)/sqrt(#pi) for y between minus infinity and x. Ranges between -1 and +1. The chance of exceeding value v when drawing from a standard normal distribution is 0.5 - 0.5*erf(v/sqrt(2)).

See also: erfc