S3 Methods for Plotting Item Probabilities

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

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

if (FALSE) {
#############################################################################
# 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)
}