Returns the inverse of the one-tailed probability of the chi-squared distribution. If probability = CHIDIST(x,...), then CHIINV(probability,...) = x. Use this function to compare observed results with expected ones to decide whether your original hypothesis is valid.
Syntax
CHIINV(probability,degrees_freedom)
Probability is a probability associated with the chi-squared distribution.
Degrees_freedom is the number of degrees of freedom.
Remarks
-
If either argument is nonnumeric, CHIINV returns the #VALUE! error value.
-
If probability < 0 or probability > 1, CHIINV returns the #NUM! error value.
-
If degrees_freedom is not an integer, it is truncated.
-
If degrees_freedom < 1 or degrees_freedom ≥ 10^10, CHIINV returns the #NUM! error value.
CHIINV uses an iterative technique for calculating the function. Given a probability value, CHIINV iterates until the result is accurate to within ± 3x10^-7. If CHIINV does not converge after 100 iterations, the function returns the #N/A error value.
Example
|
Probability |
Degrees_freedom |
Formula |
Description (Result) |
|
0.05 |
10 |
=CHIINV([Probability],[Degrees_freedom]) |
Inverse of the one-tailed probability of the chi-squared distribution (18.30703) |
