Frequencies for first 10,000 rows of bladcath variable in nhamcsed2003 dataset :

    bladder |
   catheter |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,741       97.41       97.41
        yes |        259        2.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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