# A to Z of Excel Functions: The ERF.PRECISE Function

1 January 2019

*Welcome back to our regular A to Z of Excel Functions blog. Today we look at the ERF.PRECISE function. *

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**The ERF.PRECISE function**

In mathematics, the error function (also called the Gauss error function or ERF) is a special, non-elementary function that occurs in probability, statistics and partial differential equations describing diffusion. It is defined as:

In statistics, for nonnegative values of **x**, the error function has the following interpretation: for a random variable **Y** that is normally distributed with mean 0 and variance 1/2, **ERF(x)** describes the probability of **Y** falling in the range [**?x**,** x**].

This function is similar to the **ERF** function and was introduced into Excel 2010 for compatibility reasons. The **ERF.PRECISE** function returns the error function similarly.

The **ERF.PRECISE **function employs the following syntax to operate:

**ERF.PRECISE(x)**

The **ERF.PRECISE** function has the following arguments:

**x:**Required. The lower bound for integrating**ERF.PRECISE**.

It should be further noted that:

- If
**x**is nonnumeric,**ERF.PRECISE**returns the*#VALUE!*error value.

Please see my example below:

*We’ll continue our A to Z of Excel Functions soon. Keep checking back – there’s a new blog post every business day.*

*A full page of the function articles can be found here. *