Lattice Panel Functions for Lift Plots

Two panel functions that be used in conjunction with lift.

panel.lift2(x, y, pct = 0, values = NULL, ...)

Arguments

x	the percentage of searched to be plotted in the scatterplot
y	the percentage of events found to be plotted in the scatterplot
pct	the baseline percentage of true events in the data
values	A vector of numbers between 0 and 100 specifying reference values for the percentage of samples found (i.e. the y-axis). Corresponding points on the x-axis are found via interpolation and line segments are shown to indicate how many samples must be tested before these percentages are found. The lines use either the plot.line or superpose.line component of the current lattice theme to draw the lines (depending on whether groups were used
...	options to pass to panel.xyplot

Details

panel.lift plots the data with a simple (black) 45 degree reference line.

panel.lift2 is the default for lift and plots the data points with a shaded region encompassing the space between to the random model and perfect model trajectories. The color of the region is determined by the lattice reference.line information (see example below).

See also

lift, panel.xyplot, xyplot, trellis.par.set

Examples

set.seed(1)
simulated <- data.frame(obs = factor(rep(letters[1:2], each = 100)),
                        perfect = sort(runif(200), decreasing = TRUE),
                        random = runif(200))

regionInfo <- trellis.par.get("reference.line")
regionInfo$col <- "lightblue"
trellis.par.set("reference.line", regionInfo)

lift2 <- lift(obs ~ random + perfect, data = simulated)
lift2
#> 
#> Call:
#> lift.formula(x = obs ~ random + perfect, data = simulated)
#> 
#> Models: random, perfect 
#> Event: a (50%)
xyplot(lift2, auto.key = list(columns = 2))

## use a different panel function
xyplot(lift2, panel = panel.lift)