Global Optimization of Redescending Robust Estimators

Table 5

Circle parameters (P₁, P₂, and P₃) fitted to the data obtained with different redescending estimators computed by GO and by IRLS and corresponding best values of the objective function f.

	Geman–McClure		Welsch		Tukey
	IRLS	GO	IRLS	GO	IRLS	GO
P1	−63.136	−39.995	−62.921	−39.998	−62.882	−39.998
P2	−38.527	−19.992	−38.626	−20.010	−38.632	−19.996
P3	1043.73	435.83	1038.20	436.06	1036.38	435.92
fbest	522.05	436.80	1039.69	826.86	1041.64	836.92