pbd_durspec_mean(
pars
)pars[1] corresponds to b (= la_3 in Etienne & Rosindell R2012) = speciation initiation rate
pars[2] corresponds to la_1 (= la_2 in Etienne & Rosindell 2012) = speciation completion rate
pars[3] corresponds to mu_2 (= mu_i in ER2012) = extinction rate of incipient species
pbd_durspec_density
pbd_durspec_cumdensity
pbd_durspec_mode
pbd_durspec_quantile
pbd_durspec_moment
pbd_durspec_var