Frequencies for first 10,000 rows of uca_anen variable in natl2016 dataset :

Anencephalu |
s 1 Anomaly |
   reported |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017