Frequencies for first 10,000 rows of month variable in accident dataset :

   Accident |
 Date-Month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        745        7.45        7.45
          2 |        799        7.99       15.44
          3 |        821        8.21       23.65
          4 |        829        8.29       31.94
          5 |        954        9.54       41.48
          6 |      1,024       10.24       51.72
          7 |        965        9.65       61.37
          8 |      1,004       10.04       71.41
          9 |        765        7.65       79.06
         10 |        728        7.28       86.34
         11 |        681        6.81       93.15
         12 |        685        6.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016