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

Anencephalu |
      s U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      8,248       82.48       82.48
          9 |      1,752       17.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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