Frequencies for first 10,000 rows of bladcath variable in nhamcsed1995 dataset :

    bladder |
   catheter |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,791       97.91       97.91
          1 |        209        2.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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