附件当中是全书pdf
第214页第一段(我也不知道怎么证明了)
The crucial step, according to our argument, is adding the square of
density to tqe generalized Yule model. Columns 2 and 5 show that this
addition improves the fit of the models significantly. 8 So the null hypothesis
that density dependence is monotonic turns out to be very implausible
given these data. In other words, the data strongly prefer the non-monotonic
model over the monotonic one.