Ggplot - Smooth (Geom_Smooth|Stat_Smooth)

1 - About

smoothing in Ggplot

Smooth (Smoothed conditional means) is seen as a:

  • stat - mean calculation
  • and a geom - line or point

stat_smooth() is a layer and an alias of geom_smooth(). They will add a line of best fit to a plot.

3 - Function / Method

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.


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