Frequencies for first 10,000 rows of rn variable in nhamcsed1992 dataset :

 Registered |
 nurse seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,530       25.30       25.30
          1 |      7,470       74.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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