The Excel Chisq.Inv function calculates the inverse of the left-tailed probability of the chi-square distribution. The function is new in Excel 2010 and so is not available in earlier versions of Excel.
Syntax: CHISQ.INV( probability, degrees_freedom )
|probability||–||The probability of the left-tailed 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 value is a decimal, this is truncated to an integer)
Chisq.Inv Function Examples
The spreadsheets below show examples of the Excel Chisq.Inv function, used to calculate the inverse of the left-tailed chi-square distribution for various sets of values. The spreadsheet on the left shows the formulas and the spreadsheet on the right shows the results.
Chisq.Inv Function Errors
If you get an error from the Excel Chisq.Inv function this is likely to be one of the following :
|#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|