Frequencies for first 10,000 rows of skin variable in nhamcsopd2005 dataset :

  skin exam |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,185       91.85       91.85
        yes |        815        8.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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