DDD: Diversity-Dependent Diversification
implements maximum likelihood methods based on the diversity-dependent birth-death process to test whether speciation or extinction are diversity-dependent.
See Etienne et al. 2012, Proc. Roy. Soc. B 279: 1300-1309, doi: 10.1098/rspb.2011.1439.
DDD also implements a maximum likelihood method to detect key innovations defined as decoupling of diversity-dependence.
See Etienne & Haegeman 2012, Am. Nat. 180: E75-E89, doi: 10.1086/667574.
Finally, DDD contains a function to simulate the diversity-dependent process.
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