erse, column names are referred to without quotation marks:</p>
<div class="sourceCode" id="cb17"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb17-1"><a href="get-started.html#cb17-1" tabindex="-1"></a><span class="do">## load the package functions</span></span>
<span id="cb17-2"><a href="get-started.html#cb17-2" tabindex="-1"></a><span class="fu">library</span>(dplyr)</span>
<span id="cb17-3"><a href="get-started.html#cb17-3" tabindex="-1"></a></span>
<span id="cb17-4"><a href="get-start