A 2016-07-01
#&gt; 25    C    b 19 2016-08-01</div><div class='input'>
<span class='co'># Using group argument the interval is determined over all the observations,</span>
<span class='co'># ignoring the groups.</span>
<span class='no'>x</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/data.frame'>data.frame</a></span>(<span class='kw'>dt_var</span> <span class='kw'>=</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/ba