Frequencies for first 10,000 rows of cleftlp variable in natl1989 dataset :

      Cleft |
 lip/palate |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         12        0.12        0.12
          2 |      9,751       97.51       97.63
          9 |        237        2.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016