item_pool-class

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>Numeric. The number of items in the item pool.</dd></dl><dt><code>max_cat</code></dt><dd>Numeric. The maximum number of response categories across all items.</dd><dt><code>index</code></dt><dd>Numeric. A vector of item indices.</dd><dt><code>id</code></dt><dd>Character. A vector of item ids.</dd><dt><code>model</code></dt><dd>Numeric. A vector of item model codes (1: item.1pl, 2: item_2PL, 3: item_3PL, 4: item_PC, 5: item_GPC, 6: item_GR).</dd><dt><code>NCAT</code></dt><dd>Numeric. A vector of the number of response categories for each item.</dd><dt><code>parms</code></dt><dd>A list of item parameters in the pool.</dd><dt><code>ipar</code></dt><dd>A matrix of item parameters in the pool.</dd><dt><code>se</code></dt><dd>A matrix representing standard errors of the item parameters.</dd><dt><code>raw</code></dt><dd>A data.frame containing raw input data.</dd>

item_pool-class: An S4 class to represent an item pool

Description

Arguments

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