Frequencies for first 10,000 rows of f_uca_cleftlp variable in natl2009 dataset :

      Cleft |
 Lip/Palate |
(uca_cleftl |
     p) U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         40        0.40        0.40
          1 |      9,960       99.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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