Frequencies for additionalcoverageofferedin variable in mmp2017 dataset :

 Additional |
   Coverage |
 Offered in |
    the Gap |      Freq.     Percent        Cum.
------------+-----------------------------------
        Yes |        645      100.00      100.00
------------+-----------------------------------
      Total |        645      100.00

by Jean Roth , jroth@nber.org , 6 Dec 2016