# sigmaHat

From car v2.0-13
by John Fox

##### Return the scale estimate for a regression model

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

- Keywords
- regression

##### 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

##### Examples

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

*Documentation reproduced from package car, version 2.0-13, License: GPL (>= 2)*

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