ggicc {tabledown}

A Function for Creating Publication Quality Item Response Theory based item characteristic plot.

Description

This function will create publication worthy Item Response Theory based item characteristic plot using ggplot2 from objects created from mirt pack. Using ggplot2 will enable the user to modify the item characteristic plot.

Usage

ggicc(model, item, theta)

Arguments

model

A mirt package fitted object.

item

Item number (i.e. 1,2,3,4).

theta

Theta range. Put only one number. Theta =3 will be considered as theta range (-3 to 3).

Value

A publication quality item characteristic plot. Output object is a ggplot object.

Examples

data <- tabledown::Rotter[, 11:31]
model <- mirt::mirt(data, model = 1, itemtype = '2PL', SE = TRUE, Se.type = 'MHRM')

plot <- tabledown::ggicc(model, 1, 3)