Frequencies for first 10,000 rows of outcome variable in natl1986 dataset :

 Outcome of |
       Last |
  Pregnancy |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,717       37.17       37.17
          1 |      5,020       50.20       87.37
          2 |      1,142       11.42       98.79
          3 |        121        1.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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