Table 3.
Maximum likelihood estimates of BiSSE parameters and likelihood ratio tests of alternative models based on the maximum clade credibility tree of the *BEAST analysis
| df | λI/II | λIII | μI/II | μIII | qI/II→III | qIII→I/II | lnL | AIC | χ2 | P value | No. trees with P < 0·05 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unconstrained model | 6 | 3·75 | 2·83 × 10−6 | 3·02 | 2·33 | 1·03 | 7·51 × 10−6 | −23·05 | 58·10 | — | — | — |
| Symmetric speciation (λI/II = λIII) | 5 | 2·97 | 2·97 | 1·17 | 6·45 | 2·05 | 5·25 × 10−8 | −25·54 | 61·08 | 4·97 | 0·03* | 9/10 |
| Symmetric extinction (μI/II = μIII) | 5 | 3·53 | 1·93 × 10−9 | 2·61 | 2·61 | 1·19 | 1·55 × 10−7 | −23·09 | 56·19 | 0·09 | 0·77 ns | 0/10 |
| Symmetric transition rate (qI/II→III = qIII→I/II) | 5 | 4·20 | 4·45 × 10−9 | 3·87 | 1·77 | 0·88 | 0·88 | −23·88 | 57·75 | 1·65 | 0·20 ns | 0/10 |
The last column shows the number of trees (out of a random sample of ten trees from the posterior distribution of the *BEAST analysis) where each model was significantly worse (P < 0·05) than the unconstrained model according to a likelihood ratio test. Abbreviations and symbols: df, degrees of freedom; λ, speciation rates; μ, extinction rates; q, character transition rates; lnL, log likelihood; AIC, Akaike information criterion.
*0·01 < P < 0·05; ns, not significant.