# sigma

From lme4 v1.1-21
by Ben Bolker

##### Extract Residual Standard Deviation 'Sigma'

Extract the estimated standard deviation of the errors, the “residual standard deviation” (also misnamed the “residual standard error”), from a fitted model.

##### Usage

```
# S3 method for merMod
sigma(object, …)
```

##### Arguments

- object
a fitted model.

- …
additional, optional arguments, passed from or to methods. (None currently in our two methods.)

##### Details

Package lme4 provides methods for mixed-effects models of class
`'>merMod`

and lists of linear models, `'>lmList4`

.

##### Value

Typically a number, the estimated standard deviation of the errors (“residual standard deviation”) for Gaussian models, and - less interpretably - the square root of the residual deviance per degree of freedom in more general models.

##### Examples

```
# NOT RUN {
methods(sigma)# from R 3.3.0 on, shows methods from pkgs 'stats' *and* 'lme4'
# }
```

*Documentation reproduced from package lme4, version 1.1-21, License: GPL (>= 2)*

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