2PL-class

A collection of Item Response Theory (IRT) and Computerized
Adaptive Testing (CAT) functions that are used in psychometrics.

Emre Gonulates

Item Response Theory and Computerized Adaptive Testing Functions

2PL-class function

<dl>
<dt><code>a</code></dt>
<dd>Item discrimination parameter</dd></dl>
<dt><code>b</code></dt>
<dd>Item difficulty parameter</dd>
<dt><code>D</code></dt>
<dd>Scaling constant</dd>
<dt><code>se_a</code></dt>
<dd>Standard error of item discrimination parameter</dd>
<dt><code>se_b</code></dt>
<dd>Standard error of item difficulty parameter</dd>

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Two-Parameter Logistic IRT model — 2PL-class

<dl>
<dt><code>a</code></dt>
<dd>Item discrimination parameter</dd>


<dt><code>b</code></dt>
<dd>Item difficulty parameter</dd>


<dt><code>D</code></dt>
<dd>Scaling constant</dd>


<dt><code>se_a</code></dt>
<dd>Standard error of item discrimination parameter</dd>


<dt><code>se_b</code></dt>
<dd>Standard error of item difficulty parameter</dd>


</dl>

2PL-class: Two-Parameter Logistic IRT model

Description

Arguments

Slots

Author