Frequencies for first 10,000 rows of uca_ompha variable in natlterr2009 dataset :

Omphalocele |
/Gastroschi |
    sis RFP |
761=f_uca_o |
 mphalo U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |      8,631       86.31       86.34
          9 |      1,366       13.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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