Frequencies for month variable in vehnit dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        103        8.10        8.10
          2 |         84        6.60       14.70
          3 |         87        6.84       21.54
          4 |        129       10.14       31.68
          5 |         84        6.60       38.29
          6 |        145       11.40       49.69
          7 |        104        8.18       57.86
          8 |        120        9.43       67.30
          9 |        110        8.65       75.94
         10 |        103        8.10       84.04
         11 |        103        8.10       92.14
         12 |        100        7.86      100.00
------------+-----------------------------------
      Total |      1,272      100.00

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