[R] better way to trick data frame structure?

[Seth]

Hi,

I have a data frame where 1 variable is a factor with only 1 level.  I need
the data frame structure to reflect that there are 2 levels for this factor,
even though this is not the case.  I am currently adding extra 'fake' rows
to the data frame to ensure that 2 levels are present, but this is slowing
processing time in a loop quite a bit. Can I manually specify that this
factor variable has two levels (even though this is lying to R)? 
Thanks,Seth
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