Functions and CALL Routines 
Returns the value of the (normal) error function.

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));
SAS Statements 
Results 
y=erf(1.0);

0.8427007929

y=erf(1.0);

0.842700793

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