Frequencies for first 10,000 rows of rn variable in nhamcsopd2004 dataset :

    rn seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      5,612       56.12       56.12
        yes |      4,388       43.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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