sigma: Extract Residual Standard Deviation 'Sigma'

Description Usage Arguments Details Value Examples

Description

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

Usage

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## S3 method for class '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

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methods(sigma)# from R 3.3.0 on, shows methods from pkgs 'stats' *and* 'lme4'

Example output

Loading required package: Matrix
[1] sigma.default* sigma.gls*     sigma.lmList*  sigma.lmList4* sigma.lme*    
[6] sigma.merMod*  sigma.mlm*    
see '?methods' for accessing help and source code

lme4 documentation built on June 22, 2021, 9:07 a.m.