Uncertainty in data is certainly one of the main problems in epidemiology, as shown by the recent COVID-19 pandemic. The need for efficient methods capable of quantifying uncertainty in the mathematical model is essential in order to produce realistic scenarios of the spread of infection. In this paper, we introduce a bi-fidelity approach to quantify uncertainty in spatially dependent epidemic models. The approach is based on evaluating a high-fidelity model on a small number of samples properly selected from a large number of evaluations of a low-fidelity model. In particular, we will consider the class of multiscale transport models recently introduced in [
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Figure 1. Test 1 (a): SIR model in diffusive regime. First row: expectation (left) and standard deviation (right) obtained at $ t = 5 $ for the variable $ I $ with the three methodologies, by using $ n = 8 $ points for the bi-fidelity approximation. Second row: relative $ L^2 $ errors of the bi-fidelity approximation for the mean (left) and standard deviation (right) of density $ I $ with respect to the number of "important" points $ n $ used in the bi-fidelity algorithm, compared with low-fidelity errors
Figure 2. Test 1 (b): SIR model in hyperbolic regime. First row: expectation (left) and standard deviation (right) obtained at $ t = 5 $ for the variable $ I $ with the three methodologies, by using $ n = 14 $ points for the bi-fidelity approximation. Second row: relative $ L^2 $ errors of the bi-fidelity approximation for the mean (left) and standard deviation (right) of density $ I $ with respect to the number of "important" points $ n $ used in the bi-fidelity algorithm, compared with low-fidelity errors
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Test 1 (a): SIR model in diffusive regime. First row: expectation (left) and standard deviation (right) obtained at
Test 1 (b): SIR model in hyperbolic regime. First row: expectation (left) and standard deviation (right) obtained at
Test 2 (a): SEIAR model in intermediate regime. The baseline temporal and spatial evolution of compartments
Test 2 (a): SEIAR model in intermediate regime. Expectation (left) and standard deviation (right) of densities
Test 2 (a): SEIAR model in intermediate regime. Relative
Test 2 (b): SEIAR model in hyperbolic regime. Baseline temporal and spatial evolution of compartments
Test 2 (b): SEIAR model in hyperbolic regime. Expectation (left) and standard deviation (right) of densities
Test 2 (b): SEIAR model in hyperbolic regime. Relative