Frequencies for first 10,000 rows of prmcarer variable in namcs2015 dataset :

 Percent of |
    patient |
       care |
    revenue |
       from |
   Medicare |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      1,531       15.31       15.31
          1 |      3,374       33.74       49.05
          2 |      3,626       36.26       85.31
          3 |      1,163       11.63       96.94
          4 |        306        3.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017