Frequencies for first 10,000 rows of f_uca_cleftlp variable in natl2013 dataset :

      Cleft |
 Lip/Palate |
(uca_cleftl |
     p) U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
          1 |      9,999       99.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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