Frequencies for first 10,000 rows of rn variable in nhamcsed2000 dataset :

 registered |
 nurse seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,646       16.46       16.46
          1 |      8,354       83.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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