 create a variable <code>IQ</code> as
a response variable</p>
<div class="sourceCode" id="cb2"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="va">class</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/transform.html" class="external-link">transform</a></span><span class="op">(</span><span class="va">class</span>, </span>
<span>                   IQ <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Round.html" cla