Table 2.

Likelihood Ratio Between Different Evolutionary Models

Evolutionary model
Degree of freedom
X2
P
M0 vs. M2 2 67.06 ≪0.0001
M1 vs. M2
2
30.88
≪0.0001

[i] Degree of freedom is the difference in the number of parameters between models.

χ2 is twice the difference of log likelihood between models.

P is the probability that two models should differ in log likelihood, as much as that observed, given the degree of freedom.