Extended Data Table 3 Model testing and inferred age of genotypes

From: Ancient hepatitis B viruses from the Bronze Age to the Medieval period

  1. Models were compared using path sampling, as implemented in BEAST225. Likelihood values were compared using a Bayes factor test. According to previous work65, a Bayes factor in the range of 3–20 implies positive support, 20–150 strong support and > 150 overwhelming support. a, Results of testing different clock models and population assumptions to be used for dated phylogenies. Positive numbers indicate support for the column model, and negative numbers indicate support for the row model. b, Median MRCA age of individual nodes under a strict clock and Bayesian skyline tree prior or under a relaxed log-normal clock and coalescent exponential tree prior. c, Median root age and substitution rates under different clock models and tree priors. d, Results of testing different calibration point hypotheses under a strict clock and Bayesian skyline tree prior or under a relaxed log-normal clock and coalescent exponential tree prior. The extreme maximum and minimum values for root age and substitution rate across all models are used for the numbers given in the abstract of this Letter.