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Functions and CALL Routines

ERF Function



Returns the value of the (normal) error function.
Category: Mathematical

Syntax
Arguments
Details
Examples

Syntax

ERF(argument)


Arguments

argument

specifies a numeric constant, variable, or expression.


Details

The ERF function returns the integral, given by

[equation]


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

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