ERF Function

Returns the value of the (normal) error function

Category: Mathematical

Syntax

ERF ( argument )

Arguments

argument

• is numeric.

Details

The ERF function returns the integral, given by

Examples

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