plotTIF: Plot test information function (TIF)
In secastroal/GGUM: Generalized Graded Unfolding Model

plotTIF

R Documentation

Plot test information function (TIF)

Description

plot.TIF plots the TIF for the GUM and the GGUM.

Usage

plotTIF(IP, Th)

Arguments

`IP`	Object of class `GGUM`.
`Th`	Theta estimates from function `Theta.EAP()`.

Value

The function returns the (x, y) coordinates of the TIF.

Details

This function plots the test information function (TIF).

Author(s)

Jorge N. Tendeiro, tendeiro@hiroshima-u.ac.jp

Examples

## Not run: 
# For GUM:
# Generate data
#   (toy example: Too few items (due to computation time constraints) for 
#   accurate estimation of person parameters; larger number of items is 
#   required in practice):
gen1 <- GenData.GGUM(400, 5, 3, "GUM", seed = 139)
# Fit the GUM:
fit1 <- GUM(gen1$data, 3)
th1  <- Theta.EAP(fit1)
# Plot TIF:
plotTIF(fit1, th1)

## End(Not run)
## Not run: 
# For GGUM:
# Generate data:
set.seed(1); C <- sample(3:5, 10, replace = TRUE)
gen2 <- GenData.GGUM(2000, 10, C, "GGUM", seed = 156)
# Fit the GGUM:
fit2 <- GGUM(gen2$data, C)
th2  <- Theta.EAP(fit2)
# Plot TIF:
plotTIF(fit2, th2)

## End(Not run)

secastroal/GGUM documentation built on Feb. 21, 2023, 3:39 p.m.