# Extract the residual scale of a robust regression model

### Description

Extract the robust scale estimate of the residuals from a robust regression model.

### Usage

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### Arguments

`x` |
the model fit from which to extract the robust residual scale estimate. |

`s` |
for the |

`fit` |
a character string specifying from which fit to extract the
robust residual scale estimate. Possible values are |

`...` |
additional arguments to be passed down to methods. |

### Details

Methods are implemented for models of class `"lmrob"`

(see
`lmrob`

), `"lts"`

(see
`ltsReg`

), `"rlm"`

(see
`rlm`

), `"seqModel"`

(see `rlars`

) and
`"sparseLTS"`

(see `sparseLTS`

). The default method
computes the MAD of the residuals.

### Value

A numeric vector or matrix giving the robust residual scale estimates for the requested model fits.

### Author(s)

Andreas Alfons

### See Also

`AIC`

, `lmrob`

,
`ltsReg`

, `rlm`

,
`rlars`

, `sparseLTS`

### Examples

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