Frequencies for first 10,000 rows of prothr variable in namcs2005 dataset :

 percent of |
    patient |
       care |
    revenue |
 from other |
    sources |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,343       83.43       83.43
          2 |        343        3.43       86.86
          3 |         32        0.32       87.18
          4 |         28        0.28       87.46
          9 |      1,254       12.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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