Frequencies for first 10,000 rows of prp4pr variable in namcs2007 dataset :

 percent of patient care revenue |
 from performance-based payments |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |      1,919       19.19       19.19
less than or equal to 25 percent |      7,756       77.56       96.75
                   26-50 percent |         90        0.90       97.65
                   51-75 percent |         21        0.21       97.86
            more than 75 percent |        214        2.14      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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