Frequencies for provtype variable in impact1996 dataset :

   Provider |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,439       83.71       83.71
          7 |         98        1.85       85.56
          8 |         46        0.87       86.42
         16 |        673       12.69       99.11
         17 |         38        0.72       99.83
         21 |          5        0.09       99.92
         22 |          4        0.08      100.00
------------+-----------------------------------
      Total |      5,303      100.00

by Jean Roth , jroth@nber.org , 17 Mar 2016