[R-sig-finance] Exogenous Variable in armafit

[Joe Byers]

I am trying to estimate a simple AR process but need to include trend 
components.  The documentation says exogenous variables can be included 
using the ... argument in the formula description section.  I am new to 
R and do not understand what this means.  Can anyone help?  A snippet of 
code would be great.

Thank you

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