Plot exact item-sort planning evidence — plot.contentvalid_sort

Visualizes either exact Howard-Melloy retention power across planned judge sample sizes or the minimum observed Psa implied by the exact critical target count. The critical view is drawn as a step function over every integer judge count in the displayed range, reflecting the discrete exact-binomial rule. Multiple assumed true target-assignment probabilities are solid lines told apart by their plotting symbols rather than by color, and a dashed line marks the reference power when one is given. The key sits above the curves, and the judge axis is ticked at whole numbers of judges.

Usage

# S3 method for class 'contentvalid_sort_power'
plot(
  x,
  type = c("power", "critical"),
  reference_power = NULL,
  show_legend = TRUE,
  ...
)

Arguments

x: A contentvalid_sort_power object.
type: Either "power" or "critical".
reference_power: Optional horizontal reference value for type = "power", one probability between 0 and 1. No conventional target is imposed by default.
show_legend: Logical; draw the compact power-series key. Default TRUE.
...: Additional graphical arguments passed to graphics::plot().

Value

The input object invisibly.

Examples

plan <- sort_power(N = c(20, 30, 40), true_p = c(.60, .70, .80))
plot(plan)

plot(plan, type = "critical")