Frequencies for first 10,000 rows of psa variable in namcs2014 dataset :

        PSA |
  (prostate |
   specific |
   antigen) |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,843       98.43       98.43
        Yes |        157        1.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017