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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        751        7.51        7.51
          2 |        674        6.74       14.25
          3 |        756        7.56       21.81
          4 |        791        7.91       29.72
          5 |        808        8.08       37.80
          6 |        873        8.73       46.53
          7 |        997        9.97       56.50
          8 |        912        9.12       65.62
          9 |        754        7.54       73.16
         10 |        969        9.69       82.85
         11 |        900        9.00       91.85
         12 |        815        8.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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