Frequencies for additionalcoverageofferedin variable in mmp2016 dataset :

 Additional |
   Coverage |
 Offered in |
    the Gap |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.15        0.15
        Yes |        672       99.85      100.00
------------+-----------------------------------
      Total |        673      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018