Frequencies for first 10,000 rows of typeofextracoverageinthega variable in planreport2008 dataset :

      Type of Extra Coverage in the Gap |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |      7,719       77.19       77.19
                           All Generics |        424        4.24       81.43
                 All Preferred Generics |         16        0.16       81.59
                             Few Brands |          1        0.01       81.60
                           Few Generics |        120        1.20       82.80
            Few Generics and Few Brands |        282        2.82       85.62
                Few Generics, Few Brand |        108        1.08       86.70
               Few Generics, Few Brands |         35        0.35       87.05
                          Many Generics |        317        3.17       90.22
          Many Generics and Some Brands |          3        0.03       90.25
               Many Generics, Few Brand |         21        0.21       90.46
             Many Generics, Some Brands |          2        0.02       90.48
                        No Gap Coverage |        507        5.07       95.55
                          Some Generics |        233        2.33       97.88
          Some Generics and Some Brands |        210        2.10       99.98
             Some Generics, Some Brands |          2        0.02      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016