Frequencies for first 10,000 rows of uca_anen variable in natl2014 dataset :

Anencephalu |
s 1 Anomaly |
   reported |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |      9,999       99.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016