Frequencies for first 10,000 rows of birmon variable in natl1995 dataset :

   Month of |
      Birth |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,746       47.46       47.46
          2 |      3,782       37.82       85.28
          3 |      1,472       14.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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