Frequencies for refpriv variable in namcsphys2005_2010 dataset :

 difficulty |
         in |
  referring |
   patients |
       with |
    private |
  insurance |
        for |
  specialty |
 consultati |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |         24        0.32        0.32
         -8 |        139        1.87        2.19
         -7 |        274        3.68        5.87
         -6 |      5,123       68.77       74.64
          1 |         41        0.55       75.19
          2 |        224        3.01       78.20
          3 |        320        4.30       82.49
          4 |      1,304       17.51      100.00
------------+-----------------------------------
      Total |      7,449      100.00

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