sigmaHat {car} | R Documentation

## Return the scale estimate for a regression model

### Description

This function provides a consistent method to return the estimated scale from a linear, generalized linear, nonlinear, or other model.

### Usage

    sigmaHat(object)

### Arguments

`object` | A regression object of type lm, glm or nls

### Details

For an lm or nls object, the returned quantity is the square root of the estimate of sigma. For a glm object, the returned quantity is the square root of the estimated dispersion parameter.

### Value

A nonnegative number

### Author(s)

Sanford Weisberg, sandy@umn.edu

### Examples

    m1 <- lm(prestige ~ income + education, data=Duncan)
    sigmaHat(m1)

[Package car version 2.1-2 Index]