Frequencies for provtype variable in impact2000 dataset :

   Provider |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,682       73.41       73.41
          7 |        175        3.49       76.89
          8 |         44        0.88       77.77
         14 |        360        7.18       84.95
         16 |        690       13.76       98.70
         17 |         57        1.14       99.84
         21 |          5        0.10       99.94
         22 |          3        0.06      100.00
------------+-----------------------------------
      Total |      5,016      100.00

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