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CHISQ.INV.RT function: Description, Usage, Syntax, Examples and Explanation

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What is CHISQ.INV.RT function in Excel?

CHISQ.INV.RT function is one of Statistical functions in Microsoft Excel that returns 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.

Syntax of CHISQ.INV.RT function

CHISQ.INV.RT(probability,deg_freedom)

The CHISQ.INV.RT function syntax has the following arguments:

  • Probability     Required. A probability associated with the chi-squared distribution.
  • Deg_freedom     Required. The number of degrees of freedom.

CHISQ.INV.RT formula explanation

  • 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 of CHISQ.INV.RT function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

Data Description
0.050001 Probability associated with the chi-squared distribution
10 Degrees of freedom
Formula Description Result
=CHISQ.INV.RT(A2,A3) Inverse of the one-tailed probability of the chi-squared distribution 18.306973

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