Frequencies for first 10,000 rows of rn variable in nhamcsed2004 dataset :

         rn |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |        927        9.27        9.27
        yes |      9,073       90.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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