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

      Fetal |
    Alcohol |
   Syndrome |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |      9,944       99.44       99.46
          9 |         54        0.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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