Frequencies for month variable in vehnit dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         72        6.45        6.45
          2 |         73        6.54       12.99
          3 |         66        5.91       18.91
          4 |         75        6.72       25.63
          5 |        131       11.74       37.37
          6 |         93        8.33       45.70
          7 |        119       10.66       56.36
          8 |        137       12.28       68.64
          9 |         72        6.45       75.09
         10 |         96        8.60       83.69
         11 |        101        9.05       92.74
         12 |         81        7.26      100.00
------------+-----------------------------------
      Total |      1,116      100.00

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