Frequencies for first 10,000 rows of prpatr variable in namcs2009 dataset :

 percent of patient care revenue |
            from patient payment |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        328        3.28        3.28
less than or equal to 25 percent |      9,270       92.70       95.98
                   26-50 percent |        228        2.28       98.26
                   51-75 percent |         27        0.27       98.53
            more than 75 percent |        147        1.47      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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