Frequencies for first 10,000 rows of prmanr variable in namcs2006 dataset :

 percent of patient care revenue |
     from managed care contracts |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
less than or equal to 25 percent |      2,455       24.55       24.55
                   26-50 percent |      1,878       18.78       43.33
                   51-75 percent |      1,456       14.56       57.89
            more than 75 percent |      2,004       20.04       77.93
                           blank |      2,207       22.07      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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