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

 percent of patient care revenue |
          from private insurance |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        328        3.28        3.28
less than or equal to 25 percent |      2,147       21.47       24.75
                   26-50 percent |      3,510       35.10       59.85
                   51-75 percent |      2,591       25.91       85.76
            more than 75 percent |      1,424       14.24      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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