Deviance Plot for TAM Objects

Plots the deviance change in every iteration.

plotDevianceTAM(tam.obj, omitUntil=1, reverse=TRUE, change=TRUE)

Arguments

tam.obj

Object of class tam.mml, tam.mml.2pl or tam.mml.mfr.

omitUntil

An optional value indicating number of iterations to be omitted for plotting.

reverse

A logical indicating whether the deviance change should be multiplied by minus 1. The default is TRUE.

change

An optional logical indicating whether deviance change or the deviance should be plotted.

Author

Martin Hecht, Sebastian Weirich, Alexander Robitzsch

Examples

#############################################################################
# EXAMPLE 1: deviance plot dichotomous data
#############################################################################
data(data.sim.rasch)

# 2PL model
mod1 <- TAM::tam.mml.2pl(resp=data.sim.rasch )
# plot deviance change
plotDevianceTAM( mod1 )
# plot deviance
plotDevianceTAM( mod1, change=FALSE)