Frequencies for first 10,000 rows of prprvtr variable in namcs2011 dataset :

 Percent of patient care revenue |
          from private insurance |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           Blank |        743        7.43        7.43
Less than or equal to 25 percent |      2,198       21.98       29.41
                   26-50 percent |      3,290       32.90       62.31
                   51-75 percent |      2,141       21.41       83.72
            More than 75 percent |      1,628       16.28      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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