Frequencies for first 10,000 rows of revffsr variable in namcs2008 dataset :

 percent of patient care revenue |
            from fee-for-service |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |      1,185       11.85       11.85
less than or equal to 25 percent |      2,505       25.05       36.90
                   26-50 percent |        983        9.83       46.73
                   51-75 percent |      1,340       13.40       60.13
            more than 75 percent |      3,987       39.87      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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