 <h1>Understemming Index (UI)</h1>
    <small class="dont-index">Source: <a href='https://github.com/dfalbel/ptstem/blob/master/R/performance.R'><code>R/performance.R</code></a></small>
    <div class="hidden name"><code>understemming_index.Rd</code></div>
    </div>

    <div class="ref-description">
    
    <p>It calculates the proportion of related words that had different stems.</p>
    
    </div>

    <pre class="usage"><span class='fu'>understemming_index</span>(<span class='no'>words</span>, <span 