The Excel CHISQ.DIST.RT Function

Related Functions:

Function Description

The Excel Chisq.Dist.Rt function calculates the right-tailed probability of the Chi-Square Distribution

The function is new in Excel 2010 and so is not available in earlier versions of Excel. However, the Chisq.Dist.Rt function is simply an updated version of the Chidist function, which is available in earlier versions of Excel.

The syntax of the Chisq.Dist.Rt function is:

CHISQ.DIST.RT( x, degrees_freedom )

where the function arguments are:

x	-	The value at which you want to evaluate the chi-square distribution (must be ≥ 0).
degrees_freedom	-	The number of degrees of freedom (must be an integer between 1 and 10¹⁰). (If the supplied value is a decimal, this is truncated to an integer).

Chisq.Dist.Rt Function Examples

Chi-Square Right-Tailed Distribution with 1, 2 and 3 Degrees of Freedom

Right-tailed chi-square dist. with 1, 2 & 3 degrees of freedom

The above chart on the right shows the right-tailed chi-square distribution, with 1, 2 and 3 degrees of freedom.

The value of any of these distributions, for a specified value of x can be calculated using the Excel Chisq.Dist.Rt function. Examples are shown in the spreadsheets below:

Formulas:

	A
1	=CHISQ.DIST.RT( 0.5, 1 )
2	=CHISQ.DIST.RT( 2.5, 1 )
3	=CHISQ.DIST.RT( 0.5, 2 )
4	=CHISQ.DIST.RT( 0.5, 3 )
5	=CHISQ.DIST.RT( 8, 3 )

Results:

	A
1	0.479500122
2	0.113846298
3	0.778800783
4	0.918891412
5	0.046011706

For further examples of the Excel Chisq.Dist.Rt function, see the Microsoft Office website.

Chisq.Dist.Rt Function Errors

If you get an error from the Excel Chisq.Dist.Rt function this is likely to be one of the following:

Common Errors

#NUM!

Occurs if either:

The supplied value of x is negative;
The supplied degrees_freedom argument is <1 or >10¹⁰.

#VALUE!

Occurs if either of the supplied arguments is non-numeric.

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