stat_smooth
for description. Does not support Plotly.stat_smooth_func(mapping = NULL, data = NULL, geom = "smooth",
position = "identity", ..., method = "auto", formula = y ~ x,
se = TRUE, n = 80, span = 0.75, fullrange = FALSE, level = 0.95,
method.args = list(), na.rm = FALSE, show.legend = NA,
inherit.aes = TRUE, xpos = NULL, ypos = NULL)