R help - Jan 2010 - ADF test : how to deal with the missing values ?

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hi everyone, and happy new year.
   i want to perform an Augmented Dickey Fuller test.
   the basic adf.test function doesn't work on my dataset as data are
missing.
   has a package a function enabling missing values ? does any one know a trick
   to get through ?
   thanks,
   ??douard.