# cdfF {#cdff}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`cdfF(numeratorDF, denominatorDF, X)`

## Arguments {#arguments}

**numeratorDF** and **denominatorDF** are positive integers indicating degrees of freedom of an F distribution.

**X** is a numeric scalar or vector.

## Details {#details}

Return the value of the cumulative distribution function of an F distribution.

## Examples {#examples}

```
cdfF(2.31, 0.627, [0.001, 0.5, 0.999]);
// output: [0.000444, 0.245679, 0.35098]

cdfF(2.31,0.627, [0.1, 0.3, 0.5, 0.7, 0.9]);
// output: [0.07078, 0.176153, 0.245679, 0.295996, 0.334766]
```

