# invF {#invf}

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

## Syntax {#syntax}

`invF(numeratorDF, denominatorDF, X)`

## Arguments {#arguments}

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

**X** is a floating scalar or vector between 0 and 1.

## Details {#details}

Return the value of an F inverse cumulative distribution function.

## Examples {#examples}

```
invF(2.31, 0.627, [0.001, 0.5, 0.7]);
// output: [0.002024, 2.69427, 14.992595]

invF(2.31,0.627, [0.1, 0.3, 0.5, 0.7, 0.9]);
// output: [0.146649, 0.718555, 2.69427, 14.992595, 508.444221]
```

