Spread-Level plot for variance diagnostics

Plots the square root of the absolute residuals against fitted values. A lowess smooth is added to highlight trends.

Usage

plotSpreadLevel(model)

Arguments

model

A fitted model of class lm.

Value

A ggplot object.

Examples

data(mtcars)
m <- lm(mpg ~ wt + qsec, data = mtcars)
plotSpreadLevel(m)
#> `geom_smooth()` using formula = 'y ~ x'