Frequencies for additionalcoverageofferedin variable in mmp2019 dataset :

 Additional |
   Coverage |
 Offered in |
    the Gap |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.29        0.29
        Yes |        342       99.71      100.00
------------+-----------------------------------
      Total |        343      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019