Frequencies for first 10,000 rows of refunins variable in namcs2005 dataset :

 difficulty |
         in |
  referring |
  uninsured |
   patients |
        for |
  specialty |
consultatio |
          n |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         37        0.37        0.37
          1 |      1,866       18.66       19.03
          2 |      1,764       17.64       36.67
          3 |      1,021       10.21       46.88
          4 |      2,928       29.28       76.16
          5 |      1,085       10.85       87.01
          6 |      1,299       12.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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