Frequencies for first 10,000 rows of prmcarer variable in namcs2005 dataset :

 percent of patient care revenue |
                   from medicare |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
Less than or equal to 25 percent |      5,628       56.28       56.28
                   26-50 percent |      2,742       27.42       83.70
                   51-75 percent |        960        9.60       93.30
            More than 75 percent |         16        0.16       93.46
                           Blank |        654        6.54      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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