CoopSim - A Computer Simulation of the Evolution of Cooperation. User's Manual
|
7 Advanced Topics
7.1 Technical notes on the dynamical model
Population dynamics crucially depends on two factors: How fitness is
transformed into a reproduction rate (assuming that the transformation
is always monotonous, this still leaves open quite a number of possibilities),
and whether or when species die out. The model used in CoopSim uses
population shares rather than an integer number of individuals for
each species (strategy). This means that species never die out, even
though their population share might become arbitrarily small. The reproduction
rate is determined by the score a strategy gains in the tournament
divided by the average score. Thus the reproduction rate does depend
on the payoff parameters. Both assumptions are to a certain degree
arbitrary.
Evolutionary noise (which can be adjusted via the Background noise
parameter in the simulation setup dialog) is modeled as random disturbance
on the reproduction rate (not on the population share).
g+
f
@
