Frequencies for first 10,000 rows of bladcath variable in nhamcsed1993 dataset :

    bladder |
   catheter |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,797       97.97       97.97
          1 |        203        2.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016