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

 percent of patient care revenue |
            from fee-for-service |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
less than or equal to 25 percent |      1,874       18.74       18.74
                   26-50 percent |      1,318       13.18       31.92
                   51-75 percent |        905        9.05       40.97
            more than 75 percent |      4,267       42.67       83.64
                           blank |      1,636       16.36      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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