Frequencies for first 10,000 rows of psa variable in namcs2010 dataset :

   psa test |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,786       97.86       97.86
        yes |        214        2.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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