Table 3.

The searching range of optimal γ for each non-convex penalty.

	${\ell }_{\gamma }$-norm	SCAD	Geman, Laplace, MCP	ETP, Log
Range of γ	0.1, 0.2, 0.3	3.7	0.1, 0.01, 0.001	10, 100, 1000