ggnostic Cook's distance

A function to display stats::cooks.distance().

ggally_nostic_cooksd(
  data,
  mapping,
  ...,
  linePosition = pf(0.5, length(attr(data, "var_x")), nrow(data) - length(attr(data,
    "var_x"))),
  lineColor = brew_colors("grey"),
  lineType = 2
)

Arguments

data, mapping, ..., lineColor, lineType

parameters supplied to ggally_nostic_line

linePosition

4 / n is the general cutoff point for Cook's Distance

Value

ggplot2 plot object

Details

A line is added at \(F_{p,n-p}(0.5)\) to display the general cutoff point for Cook's Distance.

Reference: Michael H. Kutner, Christopher J. Nachtsheim, John Neter, and William Li. Applied linear statistical models. The McGraw-Hill / Irwin series operations and decision sciences. McGraw-Hill Irwin, 2005, p. 403

See also

stats::cooks.distance()

Examples

# Small function to display plots only if it's interactive
p_ <- GGally::print_if_interactive

dt <- broomify(stats::lm(mpg ~ wt + qsec + am, data = mtcars))
p_(ggally_nostic_cooksd(dt, ggplot2::aes(wt, .cooksd)))