Frequencies for first 10,000 rows of typeofextracoverageoffered variable in ma2007 dataset :

       Type of Extra Coverage |
           Offered in the Gap |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
                              |      8,519       85.19       85.19
          All Formulary Drugs |         37        0.37       85.56
                     Generics |      1,308       13.08       98.64
          Generics and Brands |         68        0.68       99.32
Generics and Preferred Brands |         68        0.68      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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