> -----Original Message-----
> "Reserved words outside quotes are always parsed to be
> references to the objects linked to in the 'Description', and
> hence they are not allowed as syntactic names (see
> make.names). They are allowed as non-syntactic names, e.g.
> inside backtick quotes."
>
> You should prefer the use of "[" rather than "$".
The magic of $ also allows dat$"in" or dat$'in'
But you may have a happier time if you rename the columns to "In" and "Out",
neither of which is reserved.
S Ellison
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