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

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        924        9.24        9.24
          2 |        836        8.36       17.60
          3 |        941        9.41       27.01
          4 |        900        9.00       36.01
          5 |        934        9.34       45.35
          6 |        895        8.95       54.30
          7 |        867        8.67       62.97
          8 |        745        7.45       70.42
          9 |        695        6.95       77.37
         10 |        800        8.00       85.37
         11 |        783        7.83       93.20
         12 |        680        6.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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