> ## 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.

# cdf()

<span id="atoti.stats.beta.cdf" />

> atoti.stats.beta.cdf(<br />
>     *point*: VariableMeasureConvertible,<br />
>     /,<br />
>     \*,<br />
>     *alpha*: NumericMeasureConvertible,<br />
>     *beta*: NumericMeasureConvertible,<br />
> ) → MeasureDefinition

Cumulative distribution function for a beta distribution.

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

The cdf of the beta distribution with shape parameters $\alpha$ and $\beta$ is

$$
\operatorname {{cdf}}(x) = I_x(\alpha,\beta)
$$

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

### Parameters

<h4 id="atoti.stats.beta.cdf.point">
  *point*
</h4>

The point where the function is evaluated.

<h4 id="atoti.stats.beta.cdf.alpha">
  *alpha*
</h4>

The alpha parameter of the distribution.

<h4 id="atoti.stats.beta.cdf.beta">
  *beta*
</h4>

The beta parameter of the distribution.

***

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