smoothing in Ggplot
Smooth (Smoothed conditional means) is seen as a:
stat_smooth() is a layer and an alias of geom_smooth(). They will add a line of best fit to a plot.
Smoothing method (function) to use, eg. “lm”, “glm”, “gam”, “loess”, “rlm”.
Auto = loess is used for less than 1,000 observations; otherwise gam is used with formula = y ~ s(x, bs = “cs”). loess gives a better appearance, but is O(n^2) in memory, so does not work for larger datasets.