> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ppf()

<span id="atoti.stats.chi2.ppf" />

> atoti.stats.chi2.ppf(<br />
>     *point*: VariableMeasureConvertible,<br />
>     /,<br />
>     \*,<br />
>     *degrees\_of\_freedom*: StrictlyPositiveNumber | VariableMeasureConvertible,<br />
> ) → MeasureDefinition

Percent point function for a chi-square distribution.

<Warning>
  This feature is [`experimental`](./atoti.experimental#atoti.experimental), its key is `"stats.chi2.ppf"`.
</Warning>

Also called inverse cumulative distribution function.

### Parameters

<h4 id="atoti.stats.chi2.ppf.point">
  *point*
</h4>

The point where the function is evaluated.

<h4 id="atoti.stats.chi2.ppf.degrees_of_freedom">
  *degrees\_of\_freedom*
</h4>

The number of degrees of freedom.
Must be positive.

***

<Callout icon="link">
  **See also**:
  [The Chi-square Wikipedia page](https://en.wikipedia.org/wiki/Chi-square_distribution).
</Callout>