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erfc

(function for equations)

 

Usage:

erfc (x)

Definition:

1 – erf (x)         

Definition of erf

Required:

x is an unrestricted real

This returns the complementary error function of x.  It is useful for calculating an integral of a tail of a normal distribution.

It would be easy enough to just use 1-erf(x), but this provides better numerical accuracy when x is large (so erf(x) is very close to 1).

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