Frequencies for first 10,000 rows of uab_alcoh variable in natlterr2005 dataset :

      Fetal |
    Alcohol |
 Syndrome U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |      4,496       44.96       44.98
          9 |      1,757       17.57       62.55
          . |      3,745       37.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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