> ## 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.

# atoti.stats.f.cdf()

### atoti.stats.f.cdf(point, /, \*, numerator\_degrees\_of\_freedom, denominator\_degrees\_of\_freedom)

Cumulative distribution function for a F-distribution.

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

The cdf for a F-distributions with parameters $d1$ et $d2$ is

$$
\operatorname {{cdf}}(x) = I_{{\frac {{d_{{1}}x}}{{d_{{1}}x+d_{{2}}}}}} \left(\tfrac {{d_{{1}}}}{{2}},\tfrac {{d_{{2}}}}{{2}}\right)
$$

where I is the [regularized incomplete beta function](https://en.wikipedia.org/wiki/Beta_function#Incomplete_beta_function).

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

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