Frequencies for first 10,000 rows of prmcarer variable in namcs2011 dataset :

 Percent of patient care revenue |
                   from Medicare |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           Blank |        702        7.02        7.02
Less than or equal to 25 percent |      6,086       60.86       67.88
                   26-50 percent |      2,581       25.81       93.69
                   51-75 percent |        507        5.07       98.76
            More than 75 percent |        124        1.24      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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