ERF Function

Arguments

argument

specifies a numeric constant, variable, or expression.

The ERF function returns the integral, given by

You can use the ERF function to find the probability (p) that a normally distributed random variable with mean 0 and standard deviation will take on a value less than X. For example, the quantity that is given by the following statement is equivalent to PROBNORM(X):

p=.5+.5*erf(x/sqrt(2));

y=erf(1.0);

0.8427007929

y=erf(-1.0);

-0.842700793

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