Frequencies for first 10,000 rows of prmcarer variable in namcs2004 dataset :

 percent of patient care revenue |
                   from medicare |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
Less than or equal to 25 percent |      4,368       43.68       43.68
                   26-50 percent |      3,306       33.06       76.74
                   51-75 percent |      1,435       14.35       91.09
            More than 75 percent |        391        3.91       95.00
                           Blank |        500        5.00      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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