Component+Residual Plots

Produces component+residual (partial residual) plots for linear models.

cr_plots(x, alpha = 0.4, span = 0.75)

Arguments

x

an object of type "lm".

alpha

numeric; degree of transparency for points (0 to 1, default=0.4)

span

numeric; the degree of smoothing for loess lines (default=0.75)

Value

a ggplot2 graph

Details

This function is a modification of the crPlots function in the car package, using ggplot2 rather than base graphics.

Note

The linear model can contain factors but not interactions. Plots are based on all predictors, but only the numeric variables are plotted. Each plot has a linear and loess fit line.

See also

crPlot, crPlots

Examples

mtcars$am <- factor(mtcars$am)
fit <- lm(mpg ~ wt + am + disp + hp, mtcars)
cr_plots(fit)