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erf(x)
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