gg_boxcox: Compute and draw Box-Cox transformation plot for linear...

In oucru-biostats/C306: Collection of useful R codes for data analysis from the Biostatistics group at OUCRU

Compute and draw Box-Cox transformation plot for linear models using ggplot2

Description

A forked version of MASS::boxcox using ggplot2

Usage

gg_boxcox(object, ...)

Arguments

object	a formula or fitted model object. Currently only lm and aov objects are handled.
...	additional parameters to be used in the model fitting.
lambda	vector of values of lambda – default (-2, 2) in steps of 0.1
interp	logical which controls whether spline interpolation is used. Default to TRUE if plotting with lambda of length less than 100.
eps	Tolerance for lambda = 0; defaults to 0.02
xlab	defaults to "lambda"
ylab	defaults to "log-Likelihood"

Value

a ggplot object

See Also

boxcox

Examples

gg_boxcox(Volume ~ log(Height) + log(Girth), data = trees,
          lambda = seq(-0.25, 0.25, length = 10))

oucru-biostats/C306 documentation built on Sept. 1, 2024, 10:04 a.m.