. 2009 Aug 4;1:258–264. doi: 10.1093/gbe/evp026

Table 3.

LRT to Estimate Variable Selection Pressures of Concatenated OR Gene among Primates

Model	Foreground Species	No. of Parameter	2*Δℓ	Estimates of Parameters
One ratio (ω_B = ω_F)		9		ω_B = 0.32
Two ratio (ω_B ≠ ω_F)	Human*	10	33.1	ω_B = 0.31; ω_F = 0.57
	Chimpanzee*	10	16.2	ω_B = 0.32; ω_F = 0.44
	Orangutan*	10	33.2	ω_B = 0.30; ω_F = 0.41
	Macaque	10	7.3	ω_B = 0.33; ω_F = 0.29
	Marmoset	10	55.4	ω_B = 0.35; ω_F = 0.25

NOTE.—2 × Δℓ was obtained by 2(lnℓ₁ − lnℓ₀). lnℓ₁ was the likelihood value for two-ratio model. lnℓ₀ was the likelihood value for one-ratio model. All tests were compared with one-ratio model. Two-ratio model is significantly better than one-ratio model marked by “*” (P < 0.05). All tests were compared with one-ratio model. The two-ratio model is significantly better than one-ratio model in each lineage. ω_B means the ω ratio for the background, and ω_F means the ω ratio for the foreground.