Frequencies for first 10,000 rows of rn variable in nhamcsopd1995 dataset :

 registered |
 nurse seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,352       33.52       33.52
          1 |      6,648       66.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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