Frequencies for first 10,000 rows of uld_cord variable in natl2005 dataset :

       Cord |
 Prolapse U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         39        0.39        0.39
          2 |      9,842       98.42       98.81
          9 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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