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

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        997        9.97        9.97
          2 |        912        9.12       19.09
          3 |      1,006       10.06       29.15
          4 |      1,014       10.14       39.29
          5 |      1,020       10.20       49.49
          6 |        849        8.49       57.98
          7 |        678        6.78       64.76
          8 |        751        7.51       72.27
          9 |        655        6.55       78.82
         10 |        759        7.59       86.41
         11 |        710        7.10       93.51
         12 |        649        6.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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