levelplot_panel.ellipse: Panel functions for lattice corrgrams via levelplot

In corrgram: Plot a Correlogram

Panel functions for lattice corrgrams via levelplot

Description

These functions provide custom panel methods for lattice::levelplot().

Usage

levelplot_panel.ellipse(
  x,
  y,
  z,
  subscripts,
  at,
  level = 0.9,
  label = FALSE,
  ...
)

levelplot_panel.pie(x, y, z, subscripts, at = pretty(z), scale = 0.9, ...)

Arguments

x	Numeric coordinates from levelplot.
y	Numeric coordinates from levelplot.
z	Correlation values from levelplot.
subscripts	Subscripts for lattice panel. (not used)
at	Breaks for color levels.
level	Confidence level for ellipse (default 0.9).
label	Logical; if TRUE, show correlation values as text.
...	Additional arguments passed to panel functions.
scale	Numeric; scaling factor for pie size (default 0.8).

Details

levelplot_panel.ellipse Draws ellipses representing correlation coefficients in the upper triangle of a matrix. Optionally adds numeric labels in the lower triangle.

levelplot_panel.pie Draws pie glyphs representing correlation coefficients, omitting the diagonal.

Examples

library(lattice)
levelplot(vote, at = do.breaks(c(-1.01, 1.01), 20),
            xlab = NULL, ylab = NULL, colorkey = list(space = "top"),
            scales = list(x = list(rot = 90)), 
            panel = levelplot_panel.ellipse, label = TRUE)
levelplot(vote, at = do.breaks(c(-1.01, 1.01), 20),
            xlab = NULL, ylab = NULL, colorkey = list(space = "top"),
            scales = list(x = list(rot = 90)), 
            panel = levelplot_panel.pie, label = TRUE)

corrgram documentation built on Sept. 3, 2026, 1:06 a.m.