Frequencies for first 10,000 rows of prp4pr variable in namcs2008 dataset :

 percent of patient care revenue |
 from performance-based payments |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |      1,895       18.95       18.95
less than or equal to 25 percent |      7,883       78.83       97.78
                   26-50 percent |         90        0.90       98.68
                   51-75 percent |          6        0.06       98.74
            more than 75 percent |        126        1.26      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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