Figure 2.

Evaluating the predictive ability of the gravitation and radiation models. We used two metrics, the coefficient of determination (referred to as R²-score), and the Pearson correlation coefficient; both metrics consider the predicted flow and the observed flow of the models. Although the results show a linear correlation between the predicted and observed flows, the R²-score reveals that the predicted values are still very noisy when compared to the real ones, suggesting that neither model is accurate enough in reconstructing the commuters network.