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

 Percent of patient care revenue |
                      from other |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           Blank |        732        7.32        7.32
Less than or equal to 25 percent |      8,995       89.95       97.27
                   26-50 percent |        135        1.35       98.62
                   51-75 percent |        121        1.21       99.83
            More than 75 percent |         17        0.17      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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