Frequencies for first 10,000 rows of prothr variable in namcs2003 dataset :

 percent of |
   pat care |
    revenue |
 from other |
     source |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,032       80.32       80.32
          2 |        259        2.59       82.91
          3 |         50        0.50       83.41
          4 |        159        1.59       85.00
          9 |      1,500       15.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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