Frequencies for first 10,000 rows of revffsr variable in namcs2007 dataset :

 percent of patient care revenue |
            from fee-for-service |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |      1,351       13.51       13.51
less than or equal to 25 percent |      2,014       20.14       33.65
                   26-50 percent |        721        7.21       40.86
                   51-75 percent |      1,756       17.56       58.42
            more than 75 percent |      4,158       41.58      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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