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

 percent of patient care revenue |
            from patient payment |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        470        4.70        4.70
less than or equal to 25 percent |      9,032       90.32       95.02
                   26-50 percent |        312        3.12       98.14
                   51-75 percent |         88        0.88       99.02
            more than 75 percent |         98        0.98      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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