# invChiSquare {#invchisquare}

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

## Syntax {#syntax}

`invChiSquare(df, X)`

## Arguments {#arguments}

**df** is a positive integer indicating the degree of freedom of a chi-squared distribution.

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

## Details {#details}

Return the value of a chi-squared inverse cumulative distribution function.

## Examples {#examples}

```
invChiSquare(1, [0, 0.05, 0.15, 0.25]);
// output: [0, 0.003932, 0.035766, 0.101531]

invChiSquare(1, [0.1, 0.3, 0.5, 0.7, 0.9]);
// output: [0.015791, 0.148472, 0.454936, 1.074194, 2.705543]
```

