## Description

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

If probability = CHISQ.DIST.RT(x,...), then CHISQ.INV.RT(probability,...) = x. Use this function to compare observed results with expected ones in order to decide whether your original hypothesis is valid.

Version: Excel 2013

Syntax

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

Given a value for probability, CHISQ.INV.RT seeks that value x such that CHISQ.DIST.RT(x, deg_freedom) = probability. Thus, precision of CHISQ.INV.RT depends on precision of CHISQ.DIST.RT. CHISQ.INV.RT uses an iterative search technique. If the search has not converged after 64 iterations, the function returns the #N/A error value.

Example : Excel CHISQ.INV.RT() function
The following worksheet shows the inverse of the one-tailed probability of the chi-squared distribution.

Data Description
0.06 Probability associated with the chi-squared distribution
10 Degrees of freedom

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Source:http://www.w3resource.com/excel/excel-chisq-dot-inv-dot-rt-function.php