fortify: add information to data based on a fitted model
Description
fortify adds information to data based on a fitted model;
getData retrieves data as specified in the data
argument
Usage
fortify.merMod(model, data = getData(model),
...)
# S3 method for merMod
getData(object)
Arguments
model
fitted model
object
fitted model
data
original data set, if needed
...
additional arguments
Details
fortify is defined in the
ggplot2 package, q.v. for more details.
fortify is not defined here,
and fortify.merMod is defined as a function
rather than an S3 method, to avoid (1) inducing
a dependency on ggplot2 or (2) masking
methods from ggplot2.
This feature is both experimental and semi-deprecated,
as the help page for fortify itself says:
“Rather than using this function, I now recommend using the
broom package, which implements a much wider range of
methods. fortify may be deprecated in the future.”
The broom.mixed package is recommended for mixed models
in general.
getData is a bare-bones implementation; it relies on
a data argument having been specified and the data being
available in the environment of the formula. Unlike the functions
in the nlme package, it does not do anything special with
na.action or subset.