Frequencies for first 10,000 rows of birmon variable in natlterr1996 dataset :

   Month of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,347       53.47       53.47
          2 |      4,508       45.08       98.55
          3 |        145        1.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015