Resolution:
## Figure 14.
The influence curve of robust fitting. This curve is the derivative of the curve shown in the right panel of Figure 13.
The influence peaks for points whose distance from the curve equals the robust standard
deviation of the residuals (RSDR). The RSDR is recomputed every iteration. This means
that about two-thirds of the points get about the same influence they would have had
with least-squares regression.
Motulsky and Brown |