Frequencies for first 10,000 rows of rn variable in nhamcsed1997 dataset :

 registered |
 nurse seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,211       12.11       12.11
          1 |      8,789       87.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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