cat_clps

In a polytomous item, one or more score categories may not have the highest probability among the categories in an acceptable \(\theta\) range.
In this case, the category may possibly be regarded as redundant in a psychometric point of view and can be collapsed into another score category.
This function returns a recommendation for a recategorization scheme based on item parameters.

Item response theory (IRT) parameter estimation using marginal maximum likelihood and expectation-maximization algorithm
(Bock & Aitkin, 1981 <doi:10.1007/BF02293801>).
Within parameter estimation algorithm, several methods for latent distribution estimation are available.
Reflecting some features of the true latent distribution, these latent distribution estimation methods can possibly enhance the estimation accuracy and free the normality assumption on the latent distribution.

Seewoo Li

IRTest

Parameter Estimation of Item Response Theory with Estimation of
Latent Distribution

cat_clps function

<dl><dt>item.matrix</dt>
<dd>A matrix of item parameters.</dd>
<dt>range</dt>
<dd>A range of \(\theta\) to be evaluated. The default is <code>c(-4, 4)</code>.</dd>
<dt>increment</dt>
<dd>A width of the grid scheme. The default is <code>0.005</code>.</dd></dl>

Arguments

Seewoo Li <a href="/link/cu%40yonsei.ac.kr?package=IRTest&version=2.1.0" data-mini-rdoc="IRTest::cu@yonsei.ac.kr">cu@yonsei.ac.kr</a>

Author

A recommendation for category collapsing of items based on item parameters — cat_clps

<dl>

<dt>item.matrix</dt>
<dd>A matrix of item parameters.</dd>


<dt>range</dt>
<dd>A range of \(\theta\) to be evaluated. The default is <code>c(-4, 4)</code>.</dd>


<dt>increment</dt>
<dd>A width of the grid scheme. The default is <code>0.005</code>.</dd>

</dl>

Seewoo Li <a href='mailto:cu@yonsei.ac.kr'>cu@yonsei.ac.kr</a>

cat_clps: A recommendation for category collapsing of items based on item parameters

Description

Usage

Value

Arguments

Author