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

 Percent of |
    patient |
    revenue |
 from other |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      1,531       15.31       15.31
          1 |      8,332       83.32       98.63
          2 |         41        0.41       99.04
          3 |         57        0.57       99.61
          4 |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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