# sigmaHat

From car v3.0-3
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 \(\sigma^2\). For a glm object, the returned quantity is the square root of the estimated dispersion parameter.

##### Value

A nonnegative number

##### Examples

```
# NOT RUN {
m1 <- lm(prestige ~ income + education, data=Duncan)
sigmaHat(m1)
# }
```

*Documentation reproduced from package car, version 3.0-3, License: GPL (>= 2)*

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