Do you mean that the red line is a regression line?
Why is the regression (line) weighted?

On 2016-09-19 14:41, S Ellison wrote:
What are the red line and cut line in lm's Residuals vs Fitted plot?
The dotted line is at 0 and the red line is a locally weighted
regression calculated using lowess and plotted using panel.smooth.

See ?panel.smooth and ?lowess for details

The main clue to this is in the arguments to ?plot.lm, which uses
panel.smooth as a panel function.

S Ellison

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