Frequencies for first 10,000 rows of nursepr variable in nhamcsopd1997 dataset :

      nurse |
practitione |
     r seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,684       96.84       96.84
          1 |        316        3.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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