Frequencies for first 10,000 rows of cystosc variable in namcs2002 dataset :

 Cystoscopy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,937       99.37       99.37
        Yes |         63        0.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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