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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        810        8.10        8.10
          2 |        794        7.94       16.04
          3 |        775        7.75       23.79
          4 |        862        8.62       32.41
          5 |        833        8.33       40.74
          6 |        767        7.67       48.41
          7 |        918        9.18       57.59
          8 |        962        9.62       67.21
          9 |        837        8.37       75.58
         10 |        841        8.41       83.99
         11 |        771        7.71       91.70
         12 |        830        8.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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