Frequencies for first 10,000 rows of revffsr variable in namcs2009 dataset :

 percent of patient care revenue |
            from fee-for-service |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        916        9.16        9.16
less than or equal to 25 percent |      2,307       23.07       32.23
                   26-50 percent |      1,044       10.44       42.67
                   51-75 percent |        966        9.66       52.33
            more than 75 percent |      4,767       47.67      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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