Frequencies for first 10,000 rows of skin variable in nhamcsopd2008 dataset :

  skin exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,421       84.21       84.21
        yes |      1,579       15.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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