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

 percent of patient care revenue |
            from patient payment |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        554        5.54        5.54
less than or equal to 25 percent |      8,821       88.21       93.75
                   26-50 percent |        330        3.30       97.05
                   51-75 percent |         94        0.94       97.99
            more than 75 percent |        201        2.01      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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