plot_item_mastery function

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 class 'din'
plot_item_mastery(object, pch=c(16,17), lty=c(1,2), ...)

## S3 method for class '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.

Returns

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)
## End(Not run)