fortify.lm.Rd

% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/fortify-lm.r
\name{fortify.lm}
\alias{fortify.lm}
\title{Supplement the data fitted to a linear model with model fit statistics.}
\usage{
\method{fortify}{lm}(model, data = model$model, ...)
}
\arguments{
\item{model}{linear model}

\item{data}{data set, defaults to data used to fit model}

\item{...}{not used by this method}
}
\value{
The original data with extra columns:
\item{.hat}{Diagonal of the hat matrix}
\item{.sigma}{Estimate of residual standard deviation when
corresponding observation is dropped from model}
\item{.cooksd}{Cooks distance, \code{\link[=cooks.distance]{cooks.distance()}}}
\item{.fitted}{Fitted values of model}
\item{.resid}{Residuals}
\item{.stdresid}{Standardised residuals}
}
\description{
If you have missing values in your model data, you may need to refit
the model with \code{na.action = na.exclude}.
}
\examples{
mod <- lm(mpg ~ wt, data = mtcars)
head(fortify(mod))
head(fortify(mod, mtcars))

plot(mod, which = 1)

ggplot(mod, aes(.fitted, .resid)) +
  geom_point() +
  geom_hline(yintercept = 0) +
  geom_smooth(se = FALSE)

ggplot(mod, aes(.fitted, .stdresid)) +
  geom_point() +
  geom_hline(yintercept = 0) +
  geom_smooth(se = FALSE)

ggplot(fortify(mod, mtcars), aes(.fitted, .stdresid)) +
  geom_point(aes(colour = factor(cyl)))

ggplot(fortify(mod, mtcars), aes(mpg, .stdresid)) +
  geom_point(aes(colour = factor(cyl)))

plot(mod, which = 2)
ggplot(mod) +
  stat_qq(aes(sample = .stdresid)) +
  geom_abline()

plot(mod, which = 3)
ggplot(mod, aes(.fitted, sqrt(abs(.stdresid)))) +
  geom_point() +
  geom_smooth(se = FALSE)

plot(mod, which = 4)
ggplot(mod, aes(seq_along(.cooksd), .cooksd)) +
  geom_col()

plot(mod, which = 5)
ggplot(mod, aes(.hat, .stdresid)) +
  geom_vline(size = 2, colour = "white", xintercept = 0) +
  geom_hline(size = 2, colour = "white", yintercept = 0) +
  geom_point() + geom_smooth(se = FALSE)

ggplot(mod, aes(.hat, .stdresid)) +
  geom_point(aes(size = .cooksd)) +
  geom_smooth(se = FALSE, size = 0.5)

plot(mod, which = 6)
ggplot(mod, aes(.hat, .cooksd)) +
  geom_vline(xintercept = 0, colour = NA) +
  geom_abline(slope = seq(0, 3, by = 0.5), colour = "white") +
  geom_smooth(se = FALSE) +
  geom_point()

ggplot(mod, aes(.hat, .cooksd)) +
  geom_point(aes(size = .cooksd / .hat)) +
  scale_size_area()
}
\keyword{internal}