Frequencies for first 10,000 rows of rn variable in nhamcsed2002 dataset :

         rn |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,849       18.49       18.49
          1 |      8,151       81.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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