Frequencies for first 10,000 rows of birmon variable in natlterr2000 dataset :

   Month of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,970       49.70       49.70
          2 |      4,296       42.96       92.66
          3 |        734        7.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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