Frequencies for first 10,000 rows of f_uca_spina variable in natl2008 dataset :

      Spina |
bifida/Meni |
    ngocele |
(uca_spina) |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016