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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        720        7.20        7.20
          2 |        681        6.81       14.01
          3 |        773        7.73       21.74
          4 |        800        8.00       29.74
          5 |        860        8.60       38.34
          6 |        859        8.59       46.93
          7 |        848        8.48       55.41
          8 |        976        9.76       65.17
          9 |        866        8.66       73.83
         10 |        914        9.14       82.97
         11 |        843        8.43       91.40
         12 |        860        8.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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