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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        788        7.88        7.88
          2 |        713        7.13       15.01
          3 |        910        9.10       24.11
          4 |        790        7.90       32.01
          5 |        919        9.19       41.20
          6 |        864        8.64       49.84
          7 |        950        9.50       59.34
          8 |        887        8.87       68.21
          9 |        775        7.75       75.96
         10 |        836        8.36       84.32
         11 |        771        7.71       92.03
         12 |        797        7.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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