Frequencies for first 10,000 rows of skin variable in namcs1999 dataset :

  skin exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,846       88.46       88.46
          1 |      1,154       11.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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