The Excel CHIINV Function

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Related Function:

CHIDIST Function

CHIINV and CHISQ.INV.RT

In Excel 2010, the Chiinv function has been replaced by the Chisq.Inv.Rt function, which has improved accuracy.

Although it has been replaced, the Chiinv function is still available in Excel 2010 (stored in the list of compatibility functions), to allow compatibility with earlier versions of Excel.

Basic Description

The Excel Chiinv function calculates the inverse of the right-tailed probability of the chi-square distribution.

The syntax of the function is :

CHIINV( probability, degrees_freedom )

Where the function arguments are:

probability	-	The probability of the chi-square distribution, for which you want to find the value of x
degrees_freedom	-	The number of degrees of freedom (must be an integer between 1 and 10¹⁰) (If the supplied degrees_freedom is a decimal, this is truncated to an integer)

Relationship Between Chiinv and Chidist

The Chiinv function is the inverse of the Excel Chidist function. I.e., for a supplied probability, the Chiinv function uses an iterative method to find the value of x such that:

Chidist( x, degrees_freedom ) = probability

Chiinv Function Examples

The spreadsheets below show 5 different examples of the Excel Chiinv function, used to calculate the inverse right-tailed chi-square distribution.

The formulas are shown in the spreadsheet on the left, and the results are shown in the spreadsheet on the right.

Formulas:

Examples of use of the Excel Chiinv Function

Results:

Further examples of the Excel Chiinv function can be found on the Microsoft Office website.

Chiinv Function Errors

If you get an error from the Excel Chiinv function this is likely to be one of the following :

Common Errors

#NUM!

Occurs if either:

	-	the supplied probability value is ≤ 0 or > 1
or
	-	the supplied degrees_freedom argument is <1 or >10¹⁰

#VALUE!

Occurs if either of the supplied arguments are not recognised as numeric values

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