Frequencies for first 10,000 rows of ca_cleft variable in natlterr2014 dataset 

  Cleft Lip |
  w/ or w/o |
      Cleft |
   Palate Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,809       88.09       98.86
          U |        110        1.10       99.96
          Y |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016