ERF

ERF

Returns the value of the (normal) error function

Category: Mathematical

Syntax
Arguments
Details
Examples

Syntax

ERF(argument)

Arguments

argument: is numeric.

Details

The ERF function returns the integral, given by

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Examples

You can use the ERF 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

SAS Statements	Results
y=erf(1.0);	0.8427007929
y=erf(-1.0);	-0.842700793

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