Plot item-sort evidence — plot.contentvalid

Draws either the original one-index item plot or a correspondence-distinctiveness evidence map. The map places Psa on the x-axis and Csv on the y-axis so that intended-construct correspondence and distinctiveness can be inspected together. Target-scale means are added as diamonds when available. Colquitt benchmark bands are deliberately not drawn across item points because those norms were developed for scale-level averages rather than individual items.

Usage

# S3 method for class 'contentvalid_sort'
plot(
  x,
  metric = c("psa", "csv"),
  type = c("item", "map"),
  label = c("review", "all", "none"),
  show_legend = TRUE,
  ...
)

Arguments

x: A contentvalid_sort object.
metric: Either "psa" or "csv" for type = "item".
type: Either "item" for the original one-index plot or "map" for the correspondence-distinctiveness evidence map.
label: Which item labels to draw on the map: "review" (default), "all", or "none".
show_legend: Logical; draw the compact plot key. Default TRUE.
...: Additional graphical arguments passed to graphics::plot().

Value

The input object invisibly.