Frequencies for first 10,000 rows of uld_cord variable in natlterr2006 dataset :

       Cord |
   Prolapse |
        RFP |
723=f_uld_c |
      ord U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          8        0.08        0.08
          2 |      4,726       47.26       47.34
          9 |      1,541       15.41       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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