Smoothed trend layer
geom_smooth(
mapping = NULL,
data = NULL,
color = NULL,
alpha = NULL,
method = "loess",
se = TRUE,
linewidth = NULL,
level = 0.95
)As in geom_point().
"loess" (default) or "lm".
Draw the confidence band.
Trend line width.
Confidence level.
A Layer.