Frequencies for first 10,000 rows of skin variable in nhamcsopd2011 dataset :

  Skin exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,842       78.42       78.42
        Yes |      2,158       21.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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