plot_item: Plot of item response functions

In IRTest: Parameter Estimation of Item Response Theory with Estimation of Latent Distribution

Plot of item response functions

Description

This function draws item response functions of an item of the fitted model.

Usage

plot_item(x, item.number = 1, type = NULL)

Arguments

x	A model fit object from either IRTest_Dich, IRTest_Poly, IRTest_Cont, or IRTest_Mix.
item.number	A numeric value indicating the item number.
type	A character string required if inherits(x, c("mix")) == TRUE. It should be either "d" (dichotomous item) or "p" (polytomous item); item.number=1, type="d" indicates the first dichotomous item.

Value

This function returns a plot of item response functions.

Author(s)

Seewoo Li [e-mail]

Examples

# A preparation of dichotomous item response data

data <- DataGeneration(N=500, nitem_D = 10)$data_D

# Analysis

M1 <- IRTest_Dich(data)

# Plotting item response function

plot_item(M1, item.number = 1)

IRTest documentation built on Oct. 4, 2024, 5:11 p.m.