Frequencies for first 10,000 rows of alcosyn variable in natl1991 dataset :

      Fetal |
    Alcohol |
   Syndrome |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      9,970       99.70       99.70
          8 |          1        0.01       99.71
          9 |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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