Frequencies for first 10,000 rows of cleftlp variable in natlterr1995 dataset :

      Cleft |
 lip/palate |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |      9,990       99.90       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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