GGally (version 1.3.0)

ggally_nostic_hat: ggnostic - leverage points

Description

A function to display stats::influence's hat information against a given explanatory variable.

Usage

ggally_nostic_hat(data, mapping, ..., linePosition = 2 *
  sum(data[[deparse(mapping$y)]])/nrow(data), lineColor = brew_colors("grey"),
  lineSize = 0.5, lineAlpha = 1, lineType = 2,
  avgLinePosition = sum(data[[deparse(mapping$y)]])/nrow(data),
  avgLineColor = brew_colors("grey"), avgLineSize = lineSize,
  avgLineAlpha = lineAlpha, avgLineType = 1)

Arguments

data, mapping, ...

supplied directly to ggally_nostic_line

linePosition, lineColor, lineSize, lineAlpha, lineType

parameters supplied to ggplot2::geom_line for the cutoff line

avgLinePosition, avgLineColor, avgLineSize, avgLineAlpha, avgLineType

parameters supplied to ggplot2::geom_line for the average line

Value

ggplot2 plot object

Details

As stated in stats::influence documentation:

hat: a vector containing the diagonal of the 'hat' matrix.

The diagonal elements of the 'hat' matrix describe the influence each response value has on the fitted value for that same observation.

A suggested "cutoff" line is added to the plot at a height of 2 * p / n and an expected line at a height of p / n. If either linePosition or avgLinePosition is NULL, the respective line will not be drawn.

See Also

stats::influence

Examples

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