[R] Quick plot question

[Bernie Gardner]

Is there an easy way to add an axis or just a simple line at the 0
position of a graph with positive and negative values.  Specifically,
I'ld like to add a zero line on a plot of residuals from a fit.  I'm
very new at R so if this is a dumb question feel free to let me know but
I'ld still appreciate any help.

Thanks

Bernie
-- 
_________________
Bernie Gardner
Research Associate
ECOS, UMass Boston
100 Morrissey Blvd.
Boston, MA 02125
617-287-7451
bernie.gardner at umb.edu
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