sigma: Extract Residual Standard Deviation 'Sigma'

In lme4: Linear Mixed-Effects Models using 'Eigen' and S4

Extract Residual Standard Deviation 'Sigma'

Description

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 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

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

lme4 documentation built on Nov. 5, 2023, 9:06 a.m.