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I want to create a scatterplot in ggplot2 with one or more lines over-layed. Having looked at the documentation for geom_smooth() and geom_line(), it remains unclear to me how I can specify the equations for lines that I want to add to a plot. I understand that this must be very basic, so please feel free simply to point me toward the appropriate documentation that I must have overlooked.

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  • geom_abline(), e.g. geom_abline(aes(intercept=a,slope=b)) ... see ?geom_abline Commented Feb 16, 2013 at 17:42
  • The documentation seems to provide some examples: docs.ggplot2.org/0.9.3/geom_smooth.html Commented Feb 16, 2013 at 17:42
  • @BenBolker: Make that a solution and I'll accept it. Thanks! Commented Feb 16, 2013 at 17:48

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geom_abline() is the name of the geom you're looking for, e.g. geom_abline(aes(intercept=a,slope=b)). There are examples in the online documentation.

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