Frequencies for first 10,000 rows of outcome variable in natl1982 dataset :

 Outcome of |
       Last |
  Pregnancy |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,765       37.65       37.65
          1 |      5,068       50.68       88.33
          2 |      1,069       10.69       99.02
          3 |         98        0.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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