Table 2.

The properties of $L_q$ penalties.

Penalty	Unbiased	Sparse	Continuous	Convex	Oracle property
Ridge	No	No	Yes	Yes	No
Lasso	No	Yes	Yes	Yes	Asymptotic
Elastic net	No	Yes	Yes	Yes	No
$L_0$	No	Yes	No	No	No
$L_{1/2}$	Yes	Yes	Yes	No	Yes
SCAD	Yes	Yes	Yes	No	Yes
MCP	Yes	Yes	Yes	No	Yes