CDM (version 7.4-19)

plot_item_mastery: S3 Methods for Plotting Item Probabilities

Description

This S3 method plots item probabilities for non-masters and masters of an item.

Usage

plot_item_mastery(object, pch=c(16,17), lty=c(1,2), …)
# S3 method for din
plot_item_mastery(object, pch=c(16,17), lty=c(1,2), …)
# S3 method for gdina
plot_item_mastery(object, pch=c(16,17), lty=c(1,2), …)

Arguments

object

Object of classes din or gdina

pch

Point symbols for both groups

lty

Line symbols for both groups

…

More arguments to be passed.

Value

Plot

See Also

Plot functions for item response curves: IRT.irfprobPlot.

Examples

# NOT RUN {
#############################################################################
# EXAMPLE 1: Plot item mastery
#############################################################################

data(sim.dina)
data(sim.qmatrix)

#* estimate DINA Model
mod1 <- CDM::din(sim.dina, q.matrix=sim.qmatrix, rule="DINA")
#* estimate GDINA model
mod2 <- CDM::gdina(sim.dina, q.matrix=sim.qmatrix)

#* plots
plot_item_mastery(mod1)
plot_item_mastery(mod2)
# }