eq'>seq</a></span>(<span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/as.Date'>as.Date</a></span>(<span class='st'>'2016-01-01'</span>), <span class='kw'>length.out</span> <span class='kw'>=</span> <span class='fl'>12</span>, <span class='kw'>by</span> <span class='kw'>=</span> <span class='st'>'month'</span>)
<span class='no'>x_df_grp</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/data.frame'>data.frame</a></span