outliers were identified in the <code>presidencyYears</code> variable:</p>
<pre class="r"><code>probRows &lt;- which(presiData$presidencyYears %in% probs)

probRows</code></pre>
<pre><code>## [1] 4 8</code></pre>
<p>A brief comment on the code: The inner statement, <code>presiData$presidencyYears %in% probs</code> returns a vector of <code>TRUE</code> (for observations that are among the problematic values) and <code>FALSE</code> (for observations that are not in the <code>probs</code> vector). By wrapping 