Panel functions for lattice corrgrams via levelplot — levelplot

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)
#> 
#> Attaching package: ‘lattice’
#> The following object is masked from ‘package:corrgram’:
#> 
#>     panel.fill
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)