Frequencies for first 10,000 rows of uca_cleftlp variable in natl2005 dataset :

      Cleft |
 Lip/Palate |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         14        0.14        0.14
          2 |      9,846       98.46       98.60
          9 |        140        1.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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