Frequencies for month variable in vehnit dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        105        7.54        7.54
          2 |        105        7.54       15.08
          3 |        105        7.54       22.61
          4 |        144       10.34       32.95
          5 |        114        8.18       41.13
          6 |        114        8.18       49.32
          7 |        115        8.26       57.57
          8 |        127        9.12       66.69
          9 |        117        8.40       75.09
         10 |        113        8.11       83.20
         11 |        136        9.76       92.96
         12 |         98        7.04      100.00
------------+-----------------------------------
      Total |      1,393      100.00

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