Frequencies for ptype variable in impact2017 dataset :

   Provider |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,575       75.54       75.54
          7 |        189        5.54       81.08
          8 |         32        0.94       82.02
         14 |        148        4.34       86.36
         15 |         12        0.35       86.71
         16 |        325        9.53       96.25
         17 |        126        3.70       99.94
         21 |          1        0.03       99.97
         22 |          1        0.03      100.00
------------+-----------------------------------
      Total |      3,409      100.00

by Jean Roth , jroth@nber.org , 30 Aug 2017