Before revision:  Instead of using the (exact or approximate) solutions to the SIR (or other) model(s) and trying to adjust the time-independent parameters included in those models, we introduce dynamical parameters whose time-dependence may be phenomenologically obtained by adequately extrapolating a chosen subset of the daily provided data.
After revision:  Instead of using the (exact or approximate) solutions to the SIR (or other) model(s) and trying to adjust the time-independent parameters included in those models, we introduce dynamical parameters whose time--dependence may be phenomenologically obtained by adequately extrapolating a chosen subset of the daily provided data.