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

 Percent of |
    patient |
       care |
    revenue |
       from |
fee-for-ser |
       vice |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      2,451       24.51       24.51
          1 |        935        9.35       33.86
          2 |        659        6.59       40.45
          3 |        576        5.76       46.21
          4 |      5,379       53.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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