Frequencies for ptype variable in impact2018 dataset :

   Provider |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      2,626       77.92       77.92
         07 |        263        7.80       85.73
         08 |         31        0.92       86.65
         16 |        317        9.41       96.05
         17 |        131        3.89       99.94
         21 |          1        0.03       99.97
         22 |          1        0.03      100.00
------------+-----------------------------------
      Total |      3,370      100.00

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