content.balancing: Content balancing

In simCAT: Implements Computerized Adaptive Testing Simulations

Content balancing

Description

Constricts the selection with content balancing (CCAT or MCCAT)

Usage

content.balancing(
  bank,
  administered = NULL,
  content.names,
  content.props,
  content.items,
  met.content = "MCCAT"
)

Arguments

bank	matrix with item parameters (a, b, c)
administered	vector with administered items, NULL if it is the first item (default)
content.names	vector with the contents of the test
content.props	desirable proportion of each content in test, in the same order of content.names
content.items	vector indicating the content of each item
met.content	content balancing method MCCAT (default): the function picks all subgroups with proportions most distant from desirable. CCAT: if there is any subgroup without administered item, the function will randomly pick one. If all subgroups has at least one applied item, the function randomly picks one from those with the proportions most distant from desirable. MMM: based on the desired proportions of content, the algorithm builds a sum-one cumulative distribution. Then, a random number with uniform distribution between zero and one is drawn. This number corresponds to an area in the cumulative distribution. It is from the content located in this area that the content will be selected.

Value

A numeric vector with the items that will be excluded for selection. That is, it returns the unavailable items. If all items are available, it returns NULL.

Author(s)

Alexandre Jaloto

simCAT documentation built on Sept. 27, 2024, 9:07 a.m.