>The following objects are masked from ‘package:stats’:</span>
#&gt; <span class='message'></span>
#&gt; <span class='message'>    filter, lag</span></div><div class='output co'>#&gt; <span class='message'>The following objects are masked from ‘package:base’:</span>
#&gt; <span class='message'></span>
#&gt; <span class='message'>    intersect, setdiff, setequal, union</span></div><div class='input'><span class='co'># Load some pivoted data</span>
<span class='op'>(</span><span class='va'>x</span> <s