Frequencies for month variable in vehnit dataset :

      month |      Freq.     Percent        Cum.
------------+-----------------------------------
          3 |          1       33.33       33.33
          4 |          1       33.33       66.67
          6 |          1       33.33      100.00
------------+-----------------------------------
      Total |          3      100.00

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