Frequencies for first 10,000 rows of birmon variable in natlterr2002 dataset :

   Month of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,627       46.27       46.27
          2 |      3,880       38.80       85.07
          3 |      1,493       14.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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