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

 Crash Date |
    (MONTH) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        905        9.05        9.05
          2 |        841        8.41       17.46
          3 |        956        9.56       27.02
          4 |        870        8.70       35.72
          5 |        912        9.12       44.84
          6 |        972        9.72       54.56
          7 |        966        9.66       64.22
          8 |        802        8.02       72.24
          9 |        682        6.82       79.06
         10 |        767        7.67       86.73
         11 |        686        6.86       93.59
         12 |        641        6.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016