Frequencies for month variable in vehnit dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         90        6.78        6.78
          2 |         81        6.10       12.88
          3 |        107        8.06       20.93
          4 |        103        7.76       28.69
          5 |        115        8.66       37.35
          6 |        114        8.58       45.93
          7 |        143       10.77       56.70
          8 |        128        9.64       66.34
          9 |        125        9.41       75.75
         10 |        129        9.71       85.47
         11 |         92        6.93       92.39
         12 |        101        7.61      100.00
------------+-----------------------------------
      Total |      1,328      100.00

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