Frequencies for first 10,000 rows of prmanr variable in namcs2007 dataset :

 percent of patient care revenue |
     from managed care contracts |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |      1,905       19.05       19.05
less than or equal to 25 percent |      2,558       25.58       44.63
                   26-50 percent |      2,063       20.63       65.26
                   51-75 percent |      1,251       12.51       77.77
            more than 75 percent |      2,223       22.23      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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