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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        721        7.21        7.21
          2 |        689        6.89       14.10
          3 |        818        8.18       22.28
          4 |        822        8.22       30.50
          5 |        887        8.87       39.37
          6 |        815        8.15       47.52
          7 |        950        9.50       57.02
          8 |        947        9.47       66.49
          9 |        861        8.61       75.10
         10 |        929        9.29       84.39
         11 |        728        7.28       91.67
         12 |        833        8.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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