Frequencies for first 10,000 rows of bladcath variable in nhamcsed2008 dataset :

    bladder |
   catheter |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,743       97.43       97.43
        yes |        257        2.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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