Table 2.
Branch models used to estimate the dN/dS ratio (ω) of ranoid lineages.
| Model | Constraint of the model | −lnL∗ of the model | LRT∗∗ vs. | ||||
|---|---|---|---|---|---|---|---|
| Model 0 | 1 | 2 | 3 | ||||
| 0 | Constant ω | All neobatrachian branches have single ω | 148549.3 | — | — | — | — |
| 1 | Two ω (Afrobatrachia) | Afrobatrachian branches have one unique ω | 148536.2 | 3.2 × 10−7 | — | — | — |
| 2 | Two ω (Ranoidea) | Ranoid branches have one unique ω | 148539.0 | 5.5 × 10−6 | NC∗∗∗ | — | — |
| 3 | Eleven ω | All afrobatrachian branches have distinct ω | 148515.9 | 5.1 × 10−10 | 1.3 × 10−5 | 1.4 × 10−6 | — |
| 4 | Thirty-one ω | All ranoid branches have distinct ω | 148443.6 | 9.6 × 10−29 | 2.7 × 10−24 | 2.6 × 10−25 | 6.6 × 10−21 |
∗ − lnL: minus log likelihood. ∗∗LRT: P value of the likelihood ratio test. ∗∗∗Models 1 and 2 have the same degrees of freedom (3) and cannot be compared by LRT. However, model 2 had a higher −lnL.