Frequencies for first 10,000 rows of alcosyn variable in linkco1991us_num dataset :

      Fetal |
    alcohol |
   syndrome |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          9        0.09        0.09
          2 |      8,840       88.40       88.49
          8 |         10        0.10       88.59
          9 |      1,141       11.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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