Frequencies for first 10,000 rows of prothr variable in namcs2004 dataset :

 percent of |
   pat care |
    revenue |
 from other |
     source |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,962       79.62       79.62
          2 |        391        3.91       83.53
          3 |        197        1.97       85.50
          4 |        160        1.60       87.10
          9 |      1,290       12.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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