Fig. 3
From: EmpPrior: using outside empirical data to inform branch-length priors for Bayesian phylogenetics
Log-likelihood surfaces for c and α of the compound Dirichlet branch-length distribution. Both log-likelihood surfaces were calculated using maximum-likelihood (ML) branch lengths based on a dataset of cytochrome b and 16S sequences from alpine newts (Mesotriton alpestris) with TreeBase Study ID S1777 [11]. The left plot shows log-likelihoods based on the compound Dirichlet distribution [3] for different values of the internal:external branch-length ratio (c) with all other parameters fixed. The right plot shows log-likelihoods for different values of the concentration parameter (α) with all other parameters fixed. The dashed line in each plot shows the ML estimate for each parameter returned by EmpPrior-fit