[R] ggplot - adding regression lines

[soon yi]

Hi

I am using ggplot to overlay two regression lines on a scatter plot each
corresponding to a treatment group.

The default plot gives a different slope for each treatment group. However,
in some cases i want the lines to be parallel -ie no significant
interaction. 

My code:

ggplot(data=df,X,Y,colour=treatment) + geom_point() +
geom_smooth(method="lm")

I think i use the 'formula' option in geom_smooth but have been unable to
find a solution.

thanks for any advice.

sy




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