Frequencies for first 10,000 rows of cord variable in linkco1991us_num dataset :

       Cord |
   prolapse |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         85        0.85        0.85
          2 |      9,140       91.40       92.25
          8 |        561        5.61       97.86
          9 |        214        2.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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