Qval (version 1.1.1)

plot.Hull: Hull Plot

Description

This function can provide the Hull plot. The points suggested by the Hull method are marked in red.

Usage

# S3 method for Hull
plot(x, i, ...)

Value

None. This function is used for side effects (plotting).

Arguments

x

A list containing all the information needed to plot the Hull plot. It can be gotten from the validation object when method = "Hull".

i

A numeric, which represents the item you want to plot Hull curve.

...

Additional arguments to be passed to the plotting function.

Examples

set.seed(123)
library(Qval)

## generate Q-matrix and data
K <- 5
I <- 20
IQ <- list(
  P0 = runif(I, 0.1, 0.3),
  P1 = runif(I, 0.7, 0.9)
)

# \donttest{
Q <- sim.Q(K, I)
data <- sim.data(Q = Q, N = 500, IQ = IQ, model = "GDINA", distribute = "horder")
MQ <- sim.MQ(Q, 0.1)

CDM.obj <- CDM(data$dat, MQ)

############### ESA ###############
Hull.obj <- validation(data$dat, MQ, CDM.obj, method = "Hull", search.method = "ESA") 
Hull.fit <- Hull.obj$Hull.fit

## plot Hull curve for item 5
plot(Hull.fit, 5)

############### PAA ###############
Hull.obj <- validation(data$dat, MQ, CDM.obj, method = "Hull", search.method = "PAA") 
Hull.fit <- Hull.obj$Hull.fit

## plot Hull curve for item 5
plot(Hull.fit, 5)
# }