# Variance components of smooths from smoothness estimates

Source:`R/variance-components.R`

`variance_comp.Rd`

A wrapper to `mgcv::gam.vcomp()`

which returns the smoothing parameters
expressed as variance components.

## Usage

```
variance_comp(object, ...)
# S3 method for gam
variance_comp(object, rescale = TRUE, coverage = 0.95, ...)
```

## Arguments

- object
an R object. Currently only models fitted by

`mgcv::gam()`

or`mgcv::bam()`

are supported.- ...
arguments passed to other methods

- rescale
logical; for numerical stability reasons the penalty matrices of smooths are rescaled before fitting. If

`rescale = TRUE`

, this rescaling is undone, resulting in variance components that are on their original scale. This is needed if comparing with other mixed model software, such as`lmer()`

.- coverage
numeric; a value between 0 and 1 indicating the (approximate) coverage of the confidence interval that is returned.

## Details

This function is a wrapper to `mgcv::gam.vcomp()`

which performs
three additional services

it suppresses the annoying text output that

`mgcv::gam.vcomp()`

prints to the terminal,returns the variance of each smooth as well as the standard deviation, and

returns the variance components as a tibble.