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

 percent of patient care revenue |
                 from case rates |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |      1,544       15.44       15.44
less than or equal to 25 percent |      8,360       83.60       99.04
                   26-50 percent |         96        0.96      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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