Frequencies for month variable in vehicle dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         59        8.24        8.24
          2 |         44        6.15       14.39
          3 |         58        8.10       22.49
          4 |         54        7.54       30.03
          5 |         60        8.38       38.41
          6 |         63        8.80       47.21
          7 |         64        8.94       56.15
          8 |         42        5.87       62.01
          9 |         45        6.28       68.30
         10 |         86       12.01       80.31
         11 |         65        9.08       89.39
         12 |         76       10.61      100.00
------------+-----------------------------------
      Total |        716      100.00

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