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

 Percent of patient care revenue |
           from patient payments |      Freq.     Percent        Cum.
---------------------------------+-----------------------------------
                           Blank |        743        7.43        7.43
Less than or equal to 25 percent |      8,834       88.34       95.77
                   26-50 percent |        164        1.64       97.41
                   51-75 percent |        111        1.11       98.52
            More than 75 percent |        148        1.48      100.00
---------------------------------+-----------------------------------
                           Total |     10,000      100.00

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