stat_abline(mapping = NULL, data = NULL, geom = "abline", position = "identity", ...)
aes_string. Only needs to be set at the layer level if you are overriding the plot defaults.
layer. This can include aesthetics whose values you want to set, not map. See
layerfor more details.
Add a line with slope and intercept.
# see geom_abline
geom_ablinefor code examples.