Frequencies for first 10,000 rows of prmcarer variable in namcs2010 dataset :

 percent of patient care revenue |
                   from medicare |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        459        4.59        4.59
less than or equal to 25 percent |      5,580       55.80       60.39
                   26-50 percent |      3,130       31.30       91.69
                   51-75 percent |        769        7.69       99.38
            more than 75 percent |         62        0.62      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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