Adding a line to a ggplot2 plot and tweaking legend?

As @Andrie says, using method = "lm" gives a linear model. As for your second question, use scale_color_continuous().

As @Andrie says, using method = "lm" gives a linear model. As for your second question, use scale_color_continuous() p.

You can also label the legend simply by using labs(colour = "Fancy Title"). – joran Aug 8 at 15:36.

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