Frequencies for first 10,000 rows of rn variable in nhamcsopd2003 dataset :

    rn seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      5,161       51.61       51.61
        yes |      4,839       48.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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