Email updates

Keep up to date with the latest news and content from BMC Evolutionary Biology and BioMed Central.

Open Access Highly Accessed Research article

Exploring power and parameter estimation of the BiSSE method for analyzing species diversification

Matthew P Davis1*, Peter E Midford2 and Wayne Maddison3

Author affiliations

1 The Field Museum, 1400 South Lake Shore Drive, Chicago, IL, 60605, USA

2 NESCent: National Evolutionary Synthesis Center, 2024 W. Main Street, Suite A200, Durham, NC, 27705-4667, USA

3 University of British Columbia, 4200-6270 University Blvd, Vancouver, B.C, Canada, V6T 1Z4

For all author emails, please log on.

Citation and License

BMC Evolutionary Biology 2013, 13:38  doi:10.1186/1471-2148-13-38

Published: 11 February 2013

Abstract

Background

There has been a considerable increase in studies investigating rates of diversification and character evolution, with one of the promising techniques being the BiSSE method (binary state speciation and extinction). This study uses simulations under a variety of different sample sizes (number of tips) and asymmetries of rate (speciation, extinction, character change) to determine BiSSE’s ability to test hypotheses, and investigate whether the method is susceptible to confounding effects.

Results

We found that the power of the BiSSE method is severely affected by both sample size and high tip ratio bias (one character state dominates among observed tips). Sample size and high tip ratio bias also reduced accuracy and precision of parameter estimation, and resulted in the inability to infer which rate asymmetry caused the excess of a character state. In low tip ratio bias scenarios with appropriate tip sample size, BiSSE accurately estimated the rate asymmetry causing character state excess, avoiding the issue of confounding effects.

Conclusions

Based on our findings, we recommend that future studies utilizing BiSSE that have fewer than 300 terminals and/or have datasets where high tip ratio bias is observed (i.e., fewer than 10% of species are of one character state) should be extremely cautious with the interpretation of hypothesis testing results.

Keywords:
Key innovations; Character evolution; Systematics