Frequencies for month variable in vehicle dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         64        8.38        8.38
          2 |         60        7.85       16.23
          3 |         64        8.38       24.61
          4 |         66        8.64       33.25
          5 |         65        8.51       41.75
          6 |         64        8.38       50.13
          7 |         50        6.54       56.68
          8 |         68        8.90       65.58
          9 |         54        7.07       72.64
         10 |         61        7.98       80.63
         11 |         66        8.64       89.27
         12 |         82       10.73      100.00
------------+-----------------------------------
      Total |        764      100.00

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