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<!-- Generated by pkgdown: do not edit by hand -->
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<title>Item Parameters for Three Studies Obtained by 1PL and 2PL Estimation — data.pars1.rasch • sirt</title>
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<h1>Item Parameters for Three Studies Obtained by 1PL and 2PL Estimation</h1>
<div class="hidden name"><code>data.pars1.rasch.Rd</code></div>
</div>
<div class="ref-description">
<p>The datasets contain item parameters to be prepared for linking
using the function <code><a href='linking.haberman.html'>linking.haberman</a></code>.</p>
</div>
<pre class="usage"><span class='fu'><a href='https://rdrr.io/r/utils/data.html'>data</a></span>(<span class='no'>data.pars1.rasch</span>)
<span class='fu'><a href='https://rdrr.io/r/utils/data.html'>data</a></span>(<span class='no'>data.pars1.2pl</span>)</pre>
<h2 class="hasAnchor" id="format"><a class="anchor" href="#format"></a>Format</h2>
<ul>
<li><p>The format of <code>data.pars1.rasch</code> is:</p>
<p><code>'data.frame': 22 obs. of 4 variables:</code> <br />
<code> $ study: chr "study1" "study1" "study1" "study1" ...</code> <br />
<code> $ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> <br />
<code> $ a : num 1 1 1 1 1 1 1 1 1 1 ...</code> <br />
<code> $ b : num -1.5862 0.40762 1.78031 2.00382 0.00862 ...</code></p>
<p>Item slopes <code>a</code> are fixed to 1 in 1PL estimation. Item difficulties
are denoted by <code>b</code>. <br /></p></li>
<li><p>The format of <code>data.pars1.2pl</code> is:</p>
<p><code>'data.frame': 22 obs. of 4 variables:</code> <br />
<code> $ study: chr "study1" "study1" "study1" "study1" ...</code> <br />
<code> $ item : Factor w/ 12 levels "M133","M176",..: 1 2 3 4 5 1 6 7 3 8 ...</code> <br />
<code> $ a : num 1.238 0.957 1.83 1.927 2.298 ...</code> <br />
<code> $ b : num -1.16607 0.35844 1.06571 1.17159 0.00792 ...</code> <br /></p></li>
</ul>
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<h2>Contents</h2>
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<li><a href="#format">Format</a></li>
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