Frequencies for first 10,000 rows of rn variable in nhamcsed2001 dataset :

         rn |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,567       15.67       15.67
          1 |      8,433       84.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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