Frequencies for first 10,000 rows of rn variable in nhamcsopd1993 dataset :

 registered |
 nurse seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,018       40.18       40.18
          1 |      5,982       59.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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