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Table 1 Comparison of three clock models in BEAST analyses via Bayes factors

From: Biogeography of Coptis Salisb. (Ranunculales, Ranunculaceae, Coptidoideae), an Eastern Asian and North American genus

Clock model

Marginal likelihood

Exponential

Lognormal

Random

PS implementation

 Exponential

− 8809.70

–

37.44

−32.90

 Lognormal

− 8828.42

−37.44

–

−70.34

 Random

− 8793.25

32.90

70.34

 

SS implementation

 Exponential

− 8810.29

–

37.62

−33.72

 Lognormal

− 8829.10

−37.62

–

−71.34

 Random

−8793.43

33.72

71.34

–

  1. 2ln Bayes factor (BF) was calculated by marginal likelihoods derived from path sampling (PS) and stepping-stone sampling (SS) implementations in BEAST. 2ln BF > 2.0 represents positive evidence, > 6.00 represents strong evidence, and > 10.00 represents very strong evidence [31]