## Description

The CHISQ.INV() function is used to get the inverse of the left-tailed probability of the chi-squared distribution.

The chi-squared distribution is commonly used to study variation in the percentage of something across samples, such as the fraction of the day people spend watching television.

Version: Excel 2013

Syntax

`CHISQ.INV(probability,deg_freedom)`

Parameters

Name Description Data Type Required/
Optional
Probability A probability associated with the chi-squared distribution. number Required
Deg_freedom The number of degrees of freedom. number Required

Remarks :

• If argument is nonnumeric, CHISQ.INV returns the #VALUE! error value.
• If probability < 0 or probability > 1, CHISQ.INV returns the #NUM! error value.
• If deg_freedom is not an integer, it is truncated.
• If deg_freedom < 1 or deg_freedom > 10^10, CHISQ.INV returns the #NUM! error value.

Example - 1 : Excel CHISQ.INV() function
In the following example the inverse of the left-tailed probability of the chi-squared distribution for 0.75, using 1 degree of freedom. Example - 2 :

In the following example inverse of the left-tailed probability of the chi-squared distribution for 0.5, using 2 degrees of freedom. ï»¿