Frequencies for first 10,000 rows of cleftlp variable in natl2002 dataset :

      Cleft |
 lip/palate |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         15        0.15        0.15
          2 |      9,570       95.70       95.85
          9 |        415        4.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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