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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        733        7.33        7.33
          2 |        753        7.53       14.86
          3 |        887        8.87       23.73
          4 |        864        8.64       32.37
          5 |        817        8.17       40.54
          6 |        915        9.15       49.69
          7 |        939        9.39       59.08
          8 |        858        8.58       67.66
          9 |        728        7.28       74.94
         10 |        886        8.86       83.80
         11 |        921        9.21       93.01
         12 |        699        6.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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