Frequencies for first 10,000 rows of prmcarer variable in namcs2013 dataset :

       Percent of |
     patient care |
     revenue from |
         Medicare |      Freq.     Percent        Cum.
------------------+-----------------------------------
            Blank |      1,085       10.85       10.85
     0-25 percent |      4,609       46.09       56.94
    26-50 percent |      2,696       26.96       83.90
    51-75 percent |      1,275       12.75       96.65
   76-100 percent |        335        3.35      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017