plot.IRTest: Plot of the estimated latent distribution

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

Plot of the estimated latent distribution

Description

This function draws a plot of the estimated latent distribution (the population distribution of the latent variable).

Usage

## S3 method for class 'IRTest'
plot(x, ...)

Arguments

x	An object of "IRTest"-class obtained from either IRTest_Dich, IRTest_Poly, IRTest_Cont, or IRTest_Mix.
...	Other aesthetic argument(s) for drawing the plot. Arguments are passed on to ggplot2::stat_function, if the distribution estimation method is 2NM, KDE, or DC. Otherwise, they are passed on to ggplot2::geom_line.

Value

A plot of estimated latent distribution.

Author(s)

Seewoo Li [e-mail]

Examples

# Data generation and model fitting

data <- DataGeneration(N=1000,
                       nitem_D = 15,
                       latent_dist = "2NM",
                       d = 1.664,
                       sd_ratio = 2,
                       prob = 0.3)$data_D

M1 <- IRTest_Dich(data = data, latent_dist = "KDE")

# Plotting the latent distribution

plot(x = M1, linewidth = 1, color = 'red') +
  ggplot2::lims(x = c(-6, 6), y = c(0, .5))

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