Frequencies for first 10,000 rows of refunins variable in namcs2006 dataset :

      difficulty in |
referring uninsured |
       patients for |
          specialty |
       consultation |      Freq.     Percent        Cum.
--------------------+-----------------------------------
              blank |        183        1.83        1.83
a lot of difficulty |      1,825       18.25       20.08
    some difficulty |      1,771       17.71       37.79
  little difficulty |      1,044       10.44       48.23
      no difficulty |      3,093       30.93       79.16
         don`t know |        793        7.93       87.09
     not applicable |      1,291       12.91      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

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