  Understanding the dynamic processes of a real game system requires an
appropriate dynamics model, and rigorously testing a dynamics model is
non-trivial. In our methodological research, we develop an approach to testing
the validity of game dynamics models that considers the dynamic patterns of
angular momentum and speed as measurement variables. Using Rock-Paper-Scissors
(RPS) games as an example, we illustrate the geometric patterns in the
experiment data. We then derive the related theoretical patterns from a series
of typical dynamics models. By testing the goodness-of-fit between the
experimental and theoretical patterns, we show that the validity of these
models can be evaluated quantitatively. Our approach establishes a link between
dynamics models and experimental systems, which is, to the best of our
knowledge, the most effective and rigorous strategy for ascertaining the
testability of evolutionary game dynamics models.
