Frequencies for first 10,000 rows of prprvtr variable in namcs2007 dataset :

 percent of patient care revenue |
          from private insurance |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           blank |        584        5.84        5.84
less than or equal to 25 percent |      2,580       25.80       31.64
                   26-50 percent |      2,935       29.35       60.99
                   51-75 percent |      2,108       21.08       82.07
            more than 75 percent |      1,793       17.93      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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