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

 percent of patient care revenue |
          from private insurance |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
less than or equal to 25 percent |      1,913       19.13       19.13
                   26-50 percent |      3,874       38.74       57.87
                   51-75 percent |      2,035       20.35       78.22
            more than 75 percent |      1,290       12.90       91.12
                           blank |        888        8.88      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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