Dan, Robert, others-

>> (i) Can you use a Likelihood ratio test to test whether a birth death model 
>> fits your data better than a pure birth model? (likelihood scores are 
>> obtained from LASER).
>
> Yes, this would be valid, as the models are nested.

If I might ask, what biological inference would one draw if the pure
birth model fits better than the birth-death model? That the
extinction rate is negligible?

-Dave

-- 
David Bapst
Dept of Geophysical Sciences
University of Chicago
5734 S. Ellis
Chicago, IL 60637
http://home.uchicago.edu/~dwbapst/

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