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<!DOCTYPE html>
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<title>Person Parameter Estimation • PP</title>
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<meta property="og:description" content="The PP package includes estimation of (MLE, WLE, MAP, EAP, ROBUST)
person parameters for the 1,2,3,4-PL model and the GPCM (generalized
partial credit model). The parameters are estimated under the assumption
that the item parameters are known and fixed. The package is useful e.g. in
the case that items from an item pool / item bank with known item parameters
are administered to a new population of test-takers and an ability
estimation for every test-taker is needed.">
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<span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.6.3-11</span>
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<a href="articles/intro_pfit.html">Getting started with Person-Fit in PP</a>
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<a href="articles/intro_pp.html">Getting started with PP</a>
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<a href="articles/ppass_par_and_fit.html">Analyzing a dataset</a>
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<div id="pp" class="section level1">
<div class="page-header"><h1 class="hasAnchor">
<a href="#pp" class="anchor"></a>PP</h1></div>
<div id="version-063-is-on-cran" class="section level3">
<h3 class="hasAnchor">
<a href="#version-063-is-on-cran" class="anchor"></a>Version 0.6.3 is on cran!</h3>
<p>This R package provides Person Parameter estimation for the 1,2,3,4PL model and the generalized partial credit model. This package will soon be uploaded to cran!</p>
<p>To install this package from github, install <a href="https://github.com/hadley/devtools">devtools</a> first.</p>
<div class="sourceCode" id="cb1"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span class="fu">devtools</span><span class="fu">::</span><span class="fu"><a href="https://devtools.r-lib.org//reference/remote-reexports.html">install_github</a></span><span class="op">(</span><span class="st">"jansteinfeld/PP"</span>, build_vignettes <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></code></pre></div>
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<div id="whats-new" class="section level3">
<h3 class="hasAnchor">
<a href="#whats-new" class="anchor"></a>What’s NEW?</h3>
<ul>
<li>fixed <a href="https://github.com/yihui/knitr/issues/1864">knitr issue 1864</a> by declared ‘rmarkdown’ package as a dependency</li>
<li>
<a href="https://github.com/jansteinfeld">Jan Steinfeld</a> is now the maintainer of the package, the main feautres and whole idea of the package is from <a href="https://github.com/manuelreif">Manuel Reif</a>
</li>
<li>
<a href="https://github.com/jansteinfeld">Jan Steinfeld</a> is now on board!</li>
<li>Jan programmed the great <code><a href="reference/Pfit.html">Pfit()</a></code> function, to estimate a bunch of <strong>fit indices</strong>!</li>
<li>Use the brandnew <code><a href="reference/PPass.html">PPass()</a></code> function, to estimate Person Parameters and fit indices in one step!</li>
<li>We added a real-world dataset, which contains responses to a adaptive intelligence test. Load the data and start trying the functions of PP.</li>
<li>You can now fit your model with the great <code>eRm</code> package, and put the object into the <code><a href="reference/PPass.html">PPass()</a></code> function to estimate person parameters and person fit indices.</li>
</ul>
</div>
<div id="example" class="section level3">
<h3 class="hasAnchor">
<a href="#example" class="anchor"></a>Example</h3>
<p>Here is a small example of the new <code><a href="reference/PPass.html">PPass()</a></code> function.</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="sc">></span> <span class="fu">data</span>(pp_amt)</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="sc">></span> </span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="er">></span> d <span class="ot"><-</span> pp_amt<span class="sc">$</span>daten_amt</span>
<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="sc">></span> </span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a><span class="er">></span> rd_res <span class="ot"><-</span> <span class="fu">PPass</span>(<span class="at">respdf =</span> d, </span>
<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a><span class="sc">+</span> <span class="at">items =</span> <span class="dv">8</span><span class="sc">:</span><span class="fu">ncol</span>(d),</span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="sc">+</span> <span class="at">mod=</span><span class="st">"1PL"</span>,</span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a><span class="sc">+</span> <span class="at">thres =</span> pp_amt<span class="sc">$</span>betas[,<span class="dv">2</span>], </span>
<span id="cb2-9"><a href="#cb2-9" aria-hidden="true" tabindex="-1"></a><span class="sc">+</span> <span class="at">fitindices =</span> <span class="st">"lz"</span>)</span>
<span id="cb2-10"><a href="#cb2-10" aria-hidden="true" tabindex="-1"></a>Estimating<span class="sc">:</span> 1pl model ... </span>
<span id="cb2-11"><a href="#cb2-11" aria-hidden="true" tabindex="-1"></a>type <span class="ot">=</span> wle </span>
<span id="cb2-12"><a href="#cb2-12" aria-hidden="true" tabindex="-1"></a>Estimation finished<span class="sc">!</span></span>
<span id="cb2-13"><a href="#cb2-13" aria-hidden="true" tabindex="-1"></a><span class="er">></span> </span>
<span id="cb2-14"><a href="#cb2-14" aria-hidden="true" tabindex="-1"></a><span class="er">></span> <span class="fu">head</span>(rd_res)</span>
<span id="cb2-15"><a href="#cb2-15" aria-hidden="true" tabindex="-1"></a> estimate SE lz lz_unst</span>
<span id="cb2-16"><a href="#cb2-16" aria-hidden="true" tabindex="-1"></a><span class="dv">1</span> <span class="fl">1.4098582</span> <span class="fl">0.4177663</span> <span class="sc">-</span><span class="fl">0.631025</span> <span class="sc">-</span><span class="fl">0.613445</span></span>
<span id="cb2-17"><a href="#cb2-17" aria-hidden="true" tabindex="-1"></a><span class="dv">2</span> <span class="fl">0.3515598</span> <span class="fl">0.3728682</span> <span class="fl">1.229631</span> <span class="sc">-</span><span class="fl">0.627897</span></span>
<span id="cb2-18"><a href="#cb2-18" aria-hidden="true" tabindex="-1"></a><span class="dv">3</span> <span class="fl">1.0745005</span> <span class="fl">0.3741312</span> <span class="fl">1.097723</span> <span class="sc">-</span><span class="fl">0.627596</span></span>
<span id="cb2-19"><a href="#cb2-19" aria-hidden="true" tabindex="-1"></a><span class="dv">4</span> <span class="fl">0.3204690</span> <span class="fl">0.6900113</span> <span class="fl">0.981567</span> <span class="sc">-</span><span class="fl">0.494311</span></span>
<span id="cb2-20"><a href="#cb2-20" aria-hidden="true" tabindex="-1"></a><span class="dv">5</span> <span class="fl">1.3879169</span> <span class="fl">0.4643963</span> <span class="sc">-</span><span class="fl">0.203400</span> <span class="sc">-</span><span class="fl">0.600039</span></span>
<span id="cb2-21"><a href="#cb2-21" aria-hidden="true" tabindex="-1"></a><span class="dv">6</span> <span class="fl">0.9457360</span> <span class="fl">0.4184997</span> <span class="fl">0.573956</span> <span class="sc">-</span><span class="fl">0.615722</span></span></code></pre></div>
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<h2>Links</h2>
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<li>Download from CRAN at <br><a href="https://cloud.r-project.org/package=PP">https://cloud.r-project.org/package=PP</a>
</li>
<li>Browse source code at <br><a href="https://github.com/jansteinfeld/PP/">https://github.com/jansteinfeld/PP/</a>
</li>
<li>Report a bug at <br><a href="https://github.com/jansteinfeld/PP/issues">https://github.com/jansteinfeld/PP/issues</a>
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<h2>License</h2>
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<li><a href="https://www.r-project.org/Licenses/GPL-3">GPL-3</a></li>
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<h2>Citation</h2>
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<li><a href="authors.html">Citing PP</a></li>
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<div class="developers">
<h2>Developers</h2>
<ul class="list-unstyled">
<li>Jan Steinfeld <br><small class="roles"> Maintainer, author </small> <a href="https://orcid.org/0000-0001-9853-8260" target="orcid.widget" aria-label="ORCID"><span class="fab fa-orcid orcid" aria-hidden="true"></span></a> </li>
<li>Manuel Reif <br><small class="roles"> Author </small> </li>
</ul>
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<h2>Dev status</h2>
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<li><a href="http://www.r-pkg.org/pkg/PP"><img src="http://www.r-pkg.org/badges/version/PP"></a></li>
<li><a href="http://www.r-pkg.org/pkg/PP"><img src="http://cranlogs.r-pkg.org/badges/PP" alt="CRAN RStudio mirror downloads"></a></li>
<li><a href="https://travis-ci.org/github/manuelreif/PP"><img src="https://travis-ci.org/jansteinfeld/PP.svg?branch=master" alt="Build Status"></a></li>
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<p>Developed by Jan Steinfeld, Manuel Reif.</p>
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