Frequencies for first 10,000 rows of uca_spina variable in natl2017 dataset :

      Spina |
   Bifida / |
Meningocele |
  1 Anomaly |
   reported |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018