CHIINV

CHIINV(probability, degrees_freedom)

Returns the inverse of the probability distribution function for a chi-squared distribution (right tailed).

probability	The probability associated with the distribution.
degrees_freedom	The number of degrees of freedom.

REMARKS

* This function is only available for backwards compatibility and should not be used.
* CHISQ.INV.RT was added in Excel 2010 to replace this function.
* The chi-squared distribution is a continuous distribution
* If "probability" < 0, then #NUM! is returned.
* If "probability" > 1, then #NUM! is returned.
* If "probability" is not numeric, then #VALUE! is returned.
* If "degrees_freedom" is not an integer, it is truncated.
* If "degrees_freedom" < 1, then #NUM! is returned.
* If "degrees_freedom" = 10^10, then #NUM! is returned.
* If "degrees_freedom" is not numeric, then #VALUE! is returned.
* This function iterates until the result is accurate to within ±3x10^-7.
* If the iterative process does not converge after 100 iterations, then #N/A is returned.
* You can use the CHISQ.DIST function to return the probability distribution function OR the cumulative probability function for a chi-squared distribution (left tailed).
* You can use the CHISQ.DIST.RT function to return the probability distribution function for a chi-squared distribution (right tailed) (no cumulative).
* You can use the CHISQ.INV function to return the inverse of the probability distribution function for a chi-squared distribution (left tailed).
* You can use the CHISQ.TEST function to return the probability value from a chi-squared distribution.
* For the Microsoft documentation refer to support.microsoft.com
* For the Google documentation refer to support.google.com

	A
1	=CHIINV(0.5, 2) = 1.39
2	=CHIINV(0.05, 10) = 18.307
3	=CHIINV(0.05, 10^10) = #NUM!
4	=CHIINV(1.01, 10) = #NUM!
5	=CHIINV("some text", 10) = #VALUE!
6	=CHIINV(0.5, "some text") = #VALUE!