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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        971        9.71        9.71
          2 |        982        9.82       19.53
          3 |        731        7.31       26.84
          4 |        801        8.01       34.85
          5 |        826        8.26       43.11
          6 |        893        8.93       52.04
          7 |        805        8.05       60.09
          8 |        838        8.38       68.47
          9 |        874        8.74       77.21
         10 |        814        8.14       85.35
         11 |        734        7.34       92.69
         12 |        731        7.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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