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

 crash date |
    (month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        953        9.53        9.53
          2 |        846        8.46       17.99
          3 |      1,075       10.75       28.74
          4 |        929        9.29       38.03
          5 |        734        7.34       45.37
          6 |        760        7.60       52.97
          7 |        836        8.36       61.33
          8 |        837        8.37       69.70
          9 |        765        7.65       77.35
         10 |        827        8.27       85.62
         11 |        740        7.40       93.02
         12 |        698        6.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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