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

      Cleft |
 Lip/Palate |
        RFP |
766=f_uca_c |
 leftlp U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         15        0.15        0.15
          2 |      9,985       99.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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