Frequencies for first 10,000 rows of birmon variable in natlterr1995 dataset :

   Month of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,374       53.74       53.74
          2 |      4,390       43.90       97.64
          3 |        236        2.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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