Frequencies for first 10,000 rows of prprvtr variable in namcs2008 dataset :

 percent of patient care revenue |
          from private insurance |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        470        4.70        4.70
less than or equal to 25 percent |      1,994       19.94       24.64
                   26-50 percent |      3,360       33.60       58.24
                   51-75 percent |      2,869       28.69       86.93
            more than 75 percent |      1,307       13.07      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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