Frequencies for first 10,000 rows of outcome variable in natl1985 dataset :

 Outcome of |
       Last |
  Pregnancy |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,857       38.57       38.57
          1 |      4,908       49.08       87.65
          2 |      1,138       11.38       99.03
          3 |         97        0.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016