Frequencies for first 10,000 rows of uab_alcoh variable in natl2005 dataset :

      Fetal |
    Alcohol |
 Syndrome U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |      9,870       98.70       98.71
          9 |        129        1.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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