Frequencies for first 10,000 rows of uld_cord variable in natl2006 dataset :

       Cord |
   Prolapse |
        RFP |
723=f_uld_c |
      ord U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         21        0.21        0.21
          2 |      9,847       98.47       98.68
          9 |        132        1.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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