Frequencies for additionalcoverageofferedin variable in mmp2018 dataset :

 Additional |
   Coverage |
 Offered in |
    the Gap |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.28        0.28
        Yes |        359       99.72      100.00
------------+-----------------------------------
      Total |        360      100.00

by Jean Roth , jroth@nber.org , 10 Sep 2018