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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        785        7.85        7.85
          2 |        733        7.33       15.18
          3 |        807        8.07       23.25
          4 |        849        8.49       31.74
          5 |        877        8.77       40.51
          6 |        889        8.89       49.40
          7 |        918        9.18       58.58
          8 |        881        8.81       67.39
          9 |        897        8.97       76.36
         10 |        858        8.58       84.94
         11 |        797        7.97       92.91
         12 |        709        7.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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