Frequencies for first 10,000 rows of birmon variable in natlterr2001 dataset :

   Month of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,814       48.14       48.14
          2 |      4,139       41.39       89.53
          3 |      1,047       10.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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