Frequencies for first 10,000 rows of typeofextracoverageoffered variable in maa_to_m2009 dataset :

       Type of Extra Coverage |
           Offered in the Gap |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
                              |      4,511       45.11       45.11
          All Formulary Drugs |         14        0.14       45.25
                 All Generics |        471        4.71       49.96
  All Generics and Few Brands |          4        0.04       50.00
  Few Generics and Few Brands |        787        7.87       57.87
                Many Generics |        995        9.95       67.82
 Many Generics and Few Brands |         61        0.61       68.43
Many Generics and Some Brands |         23        0.23       68.66
              No Gap Coverage |      2,981       29.81       98.47
                Some Generics |        136        1.36       99.83
 Some Generics and Few Brands |         16        0.16       99.99
Some Generics and Some Brands |          1        0.01      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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