   &lt;fct&gt; &lt;fct&gt; &lt;fct&gt;  &lt;int&gt;
##  1 2015-01-04 day       2015  1     3       6830
##  2 2015-01-04 night     2015  1     3       2404
##  3 2015-01-05 day       2015  1     3      14763
##  4 2015-01-05 night     2015  1     3       5609
##  5 2015-01-06 day       2015  1     3      14501
##  6 2015-01-06 night     2015  1     3       6112
##  7 2015-01-07 day       2015  1     3      16358
##  8 2015-01-07 night     2015  1     3       4706
##  9 2015-01-08 day       2015  1     3    