item_pool-class

<code><a href="/link/?package=TestDesign&version=1.1.3" item_pool'="" data-mini-rdoc="TestDesign::"></a>'>item_pool</code> is an S4 class to represent an item pool.

Use the optimal test design approach by Birnbaum (1968, ISBN:9781593119348) and
van der Linden (2018) <doi:10.1201/9781315117430> in constructing fixed and adaptive tests. Supports the following
mixed-integer programming (MIP) solver packages: 'lpsymphony', 'Rsymphony', 'gurobi', 'lpSolve', and 'Rglpk'. The 'gurobi' package
is not available from CRAN; see <https://www.gurobi.com/downloads/>. See vignette for installing 'Rsymphony' package
on Mac systems.

Seung W. Choi

TestDesign

Optimal Test Design Approach to Fixed and Adaptive Test
Construction

Sangdon Lim

item_pool-class function

<dl class="dl-horizontal">
<dt><code>ni</code></dt><dd>the number of items in the pool.</dd></dl><dt><code>max_cat</code></dt><dd>the maximum number of response categories across the pool.</dd><dt><code>index</code></dt><dd>the numeric index of each item.</dd><dt><code>id</code></dt><dd>the ID string of each item.</dd><dt><code>model</code></dt><dd>the item class name of each item. See <code><a rd-options="" href="/link/item-classes?package=TestDesign&version=1.1.3" data-mini-rdoc="TestDesign::item-classes">item-classes</a></code>.</dd><dt><code>NCAT</code></dt><dd>the number of response categories of each item.</dd><dt><code>parms</code></dt><dd>a list containing item class objects. See <code><a rd-options="" href="/link/item-classes?package=TestDesign&version=1.1.3" data-mini-rdoc="TestDesign::item-classes">item-classes</a></code>.</dd><dt><code>ipar</code></dt><dd>a matrix containing item parameters.</dd><dt><code>se</code></dt><dd>a matrix containing item parameter standard errors.</dd><dt><code>raw</code></dt><dd>the raw input <code><a rd-options="" href="/link/data.frame?package=TestDesign&version=1.1.3" data-mini-rdoc="TestDesign::data.frame">data.frame</a></code> used in <code><a rd-options="" href="/link/loadItemPool?package=TestDesign&version=1.1.3" data-mini-rdoc="TestDesign::loadItemPool">loadItemPool</a></code> to create this object.</dd><dt><code>raw_se</code></dt><dd>the raw input <code><a rd-options="" href="/link/data.frame?package=TestDesign&version=1.1.3" data-mini-rdoc="TestDesign::data.frame">data.frame</a></code> used in <code><a rd-options="" href="/link/loadItemPool?package=TestDesign&version=1.1.3" data-mini-rdoc="TestDesign::loadItemPool">loadItemPool</a></code> to create this object.</dd>

Slots

<code><a href='<a href='item_pool'></a>'>item_pool</a></code> is an S4 class to represent an item pool.

item_pool-class: Class 'item_pool': an item pool

Description

Arguments

Slots

Details