Fig. 2. Practical identifiability of the SIAR model in Fig. 1 as a function of the fraction γ of asymptomatic new infectious individuals.

(A) Sensitivity σ and η of measured and hidden variables, respectively, to the parameters of the model. (B) Sensitivity μ of the hidden variables to the measured ones. (C) State variables for unperturbed values of parameters (with γ = 0.86, solid line) and for a perturbation with ∥δp ∥ = 0.3 ∥ p∥ along the first eigenvector of M (dashed lines).