# preprocess.residual_scale()

Robust standard deviation of the raw-minus-smoothed capacity residuals.

Usage

[Source](https://github.com/lornearnold/driven-pile/blob/main/src/driven_pile/preprocess.py#L205-L219)

``` python
preprocess.residual_scale(target)
```

## Parameters

`target: Target`  

## Returns

`float`  
`1.4826 * median(|r - median(r)|)` over the logged feet, kips.