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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        697        6.97        6.97
          2 |        749        7.49       14.46
          3 |        807        8.07       22.53
          4 |        747        7.47       30.00
          5 |        913        9.13       39.13
          6 |        843        8.43       47.56
          7 |        825        8.25       55.81
          8 |        967        9.67       65.48
          9 |        889        8.89       74.37
         10 |        829        8.29       82.66
         11 |        828        8.28       90.94
         12 |        906        9.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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