plot {TestDesign}

Extension of plot() for objects in TestDesign package

Description

Extension of plot() for objects in TestDesign package

Usage

## S4 method for signature 'item_pool'
plot(
  x,
  y,
  type = "info",
  theta = seq(-3, 3, 0.1),
  info_type = "FISHER",
  plot_sum = TRUE,
  select = NULL,
  examinee_id = 1,
  position = NULL,
  theta_range = c(-5, 5),
  ylim = NULL,
  color = "blue",
  z_ci = 1.96,
  simple = TRUE,
  theta_type = "Estimated",
  color_final = "blue",
  segment = NULL,
  rmse = FALSE,
  use_segment_label = TRUE,
  use_par = TRUE,
  ...
)

## S4 method for signature 'output_Static'
plot(
  x,
  y,
  type = NULL,
  theta = seq(-3, 3, 0.1),
  info_type = "FISHER",
  plot_sum = TRUE,
  select = NULL,
  examinee_id = 1,
  position = NULL,
  theta_range = c(-5, 5),
  ylim = NULL,
  color = "blue",
  z_ci = 1.96,
  simple = TRUE,
  use_par = TRUE,
  ...
)

## S4 method for signature 'constraints'
plot(
  x,
  y,
  type = "info",
  theta = seq(-3, 3, 0.1),
  info_type = "FISHER",
  plot_sum = TRUE,
  select = NULL,
  examinee_id = 1,
  position = NULL,
  theta_range = c(-5, 5),
  ylim = NULL,
  color = "blue",
  z_ci = 1.96,
  simple = TRUE,
  use_par = TRUE,
  ...
)

## S4 method for signature 'output_Shadow'
plot(
  x,
  y,
  type = "audit",
  theta = seq(-3, 3, 0.1),
  info_type = "FISHER",
  plot_sum = TRUE,
  select = NULL,
  examinee_id = 1,
  theta_range = c(-5, 5),
  ylim = NULL,
  color = "blue",
  z_ci = 1.96,
  simple = FALSE,
  theta_type = "Estimated",
  use_par = TRUE,
  ...
)

## S4 method for signature 'output_Shadow_all'
plot(
  x,
  y,
  type = "audit",
  theta = seq(-3, 3, 0.1),
  info_type = "FISHER",
  plot_sum = TRUE,
  select = NULL,
  examinee_id = 1,
  position = NULL,
  theta_range = c(-5, 5),
  ylim = NULL,
  color = "blue",
  z_ci = 1.96,
  simple = FALSE,
  theta_type = "Estimated",
  color_final = "blue",
  segment = NULL,
  rmse = FALSE,
  use_segment_label = TRUE,
  use_par = TRUE,
  ...
)

## S4 method for signature 'output_Split'
plot(
  x,
  y,
  type = NULL,
  theta = seq(-3, 3, 0.1),
  info_type = "FISHER",
  plot_sum = TRUE,
  select = NULL,
  examinee_id = 1,
  position = NULL,
  theta_range = c(-5, 5),
  ylim = NULL,
  color = "blue",
  z_ci = 1.96,
  simple = TRUE,
  use_par = TRUE,
  ...
)

Arguments

x

accepts the following signatures:

• item_pool: plot information and expected scores.

• constraints: plot information range based on the test length constraint.

• output_Static: plot information and expected scores based on the fixed assembly solution.

• output_Shadow_all: plot audit trail, shadow test chart, and exposure rates from the adaptive assembly solution.

• output_Shadow: plot audit trail and shadow test chart from the adaptive assembly solution.

y

not used, exists for compatibility with plot in the base R package.

type

the type of plot.

• info plots information from item_pool, output_Static, and output_Shadow_all.

• score plots expected scores from item_pool and output_Static.

• audit plots audit trail from output_Shadow_all and output_Shadow.

• shadow plots shadow test chart from output_Shadow_all and output_Shadow.

• exposure plots exposure rates from output_Shadow_all.

theta

the theta grid to use in plotting. (default = seq(-3, 3, .1))

info_type

the type of information. Currently accepts FISHER. (default = FISHER)

plot_sum

used in item_pool objects.

• if TRUE then plot pool-level values.

• if FALSE then plot item-level values, and repeat for all items in the pool.

• (default = TRUE)

select

used in item_pool objects. Item indices to subset.

examinee_id

used in output_Shadow and output_Shadow_all with type = 'audit' and type = 'shadow'. The examinee numeric ID to draw the plot.

position

used in output_Shadow_all with type = 'info'. The item position to draw the plot.

theta_range

used in output_Shadow and output_Shadow_all with type = 'audit'. The theta range to plot. (default = c(-5, 5))

ylim

(optional) the y-axis plot range. Used in most plot types.

color

the color of the curve.

z_ci

used in output_Shadow and output_Shadow_all with type = 'audit'. The range to use for confidence intervals. (default = 1.96)

simple

used in output_Shadow and output_Shadow_all with type = 'shadow'. If TRUE, simplify the chart by hiding unused items.

theta_type

used in output_Shadow_all with type = 'exposure'. The type of theta to determine exposure segments. Accepts Estimated or True. (default = Estimated)

color_final

used in output_Shadow_all with type = 'exposure'. The color of item-wise exposure rates, only counting the items administered in the final theta segment as exposed.

segment

used in output_Shadow_all with type = 'exposure'. (optional) The segment index to draw the plot. Leave empty to use all segments.

rmse

used in output_Shadow_all with type = 'exposure'. If TRUE, display the RMSE value for each segment. (default = FALSE)

use_segment_label

used in output_Shadow_all with type = 'exposure'. If TRUE, display the segment label for each segment. (default = TRUE)

use_par

if FALSE, graphical parameters are not overridden inside the function. (default = TRUE)

...

arguments to pass onto plot.

Examples

subitempool <- itempool_science[1:8]

## Plot item information of a pool
plot(subitempool)
plot(itempool_science, select = 1:8)

## Plot expected score of a pool
plot(subitempool, type = "score")
plot(itempool_science, type = "score", select = 1:8)

## Plot assembly results from Static()
cfg <- createStaticTestConfig()
solution <- Static(cfg, constraints_science)
plot(solution)                 # defaults to the objective type
plot(solution, type = "score") # plot expected scores

## Plot attainable information range from constraints
plot(constraints_science)

## Plot assembly results from Shadow()
cfg <- createShadowTestConfig()
set.seed(1)
solution <- Shadow(cfg, constraints_science, true_theta = rnorm(1))
plot(solution, type = 'audit' , examinee_id = 1)
plot(solution, type = 'shadow', examinee_id = 1, simple = TRUE)

## plot(solution, type = 'exposure')