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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        771        7.71        7.71
          2 |        744        7.44       15.15
          3 |        816        8.16       23.31
          4 |        778        7.78       31.09
          5 |        817        8.17       39.26
          6 |        879        8.79       48.05
          7 |        859        8.59       56.64
          8 |        881        8.81       65.45
          9 |        804        8.04       73.49
         10 |        924        9.24       82.73
         11 |        901        9.01       91.74
         12 |        826        8.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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