> ## Documentation Index
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# atoti.stats.chi2.cdf()

### atoti.stats.chi2.cdf(point, /, \*, degrees\_of\_freedom)

Cumulative distribution function for a chi-square distribution.

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

The cdf of the chi-square distribution with k degrees of freedom is

$$
\operatorname {{cdf}}(x)=\dfrac {{\gamma (\frac {{k}}{{2}},\,\frac {{x}}{{2}})}}{{\Gamma (\frac {{k}}{{2}})}}
$$

where $\Gamma$ is the [gamma function](https://en.wikipedia.org/wiki/Gamma_function)
and $\gamma$ the [lower incomplete gamma function](https://en.wikipedia.org/wiki/Incomplete_gamma_function).

* **Parameters:**
  * **point** (*VariableMeasureConvertible*) – The point where the function is evaluated.
  * **degrees\_of\_freedom** (*StrictlyPositiveNumber* *|* *VariableMeasureConvertible*) – The number of degrees of freedom.
    Must be positive.
* **Return type:**
  MeasureDefinition

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