# Documentation/Calc Functions/CHISQINV

Jump to navigation Jump to search

CHISQINV

## Category:

Statistical Analysis

## Summary:

Returns the inverse of the cumulative distribution function for the one-tailed chi-square distribution.

## Syntax:

CHISQINV(Probability; DegreesFreedom)

## Returns:

Returns a non-negative real number which is the inverse cumulative distribution function for the one-tailed chi-square distribution. If p = CHISQDIST(x;n), then CHISQINV(p,n) = x.

## Arguments:

Probability is a real number from 0 to 1 or a reference to the cell containing that number which is the probability value for which the inverse of the chi-square distribution is to be calculated.

DegreesFreedom is a positive integer or a reference to a cell containing that number which is the degrees of freedom for the chi-square function.

• If Probability is greater than 1 or less than 0, then the function returns an error value.
• If DegreesFreedom is less than 1, the function returns an error value.
• If DegreesFreedom is a non-integer numeric value, then the function truncates it to an integer.

## Additional details:

For more details on the inverse chi-square distribution, visit Wikipedia

## Examples:

Formula Description Returns
=CHISQINV(0.75;5) Inverse of the one-tailed probability of the chi-square distribution. Here we can check that =CHISQINV(CHISQDIST(0.020975769403022;5);5) returns 0.020975769403022. 0.020975769403022
=CHISQINV(1.2;5) Number greater than 1 so the function returns an error value Err:502
=CHISQINV(0.2;0.9) DegreesFreedom less than 1 so the function returns an error value Err:502

None