Individual item category probability plots

Uses eRm::PCM() and eRm::plotICC().

Usage

RIitemCats(data, items = "all", xlims = c(-6, 6), legend = FALSE)

Arguments

data

Dataframe with item data only

items

Optionally a single item "q4", or a vector c("q4","q2")

xlims

Start/end point for x-axis

legend

Set to a position such as "left" if desired