Table 5. Parameter estimates and likelihood ratio statistics (2Δl) for insect sodium channel genes.

Models	p	l	Parameter estimates	2Δl	PSSs
M0 (one-ratio)	1	−4777.5	ω = 0.02		None
M1a (neutral)	2	−4748.3	p0 = 0.98 (p1 = 0.02)		Not allowed
			ω0 = 0.01 (ω1 = 1)	0
M2a (selection)	4	−4748.3	p0 = 0.98		None
			p1 = 0.01 (p2 = 0.01)
			ω0 = 0.01 (ω1 = 1)
			ω2 = 1
M7 (beta)	2	−4655.9	p = 0.13, q = 4.67	0	Not allowed
M8 (beta & ω)	4	−4655.9	p0 = 1 (p1 = 0)		None
			p = 0.13, q = 4.67
			ωs = 1.24