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

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        950        9.50        9.50
          2 |        848        8.48       17.98
          3 |        986        9.86       27.84
          4 |        966        9.66       37.50
          5 |        897        8.97       46.47
          6 |        904        9.04       55.51
          7 |        795        7.95       63.46
          8 |        748        7.48       70.94
          9 |        718        7.18       78.12
         10 |        745        7.45       85.57
         11 |        721        7.21       92.78
         12 |        722        7.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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