Fig. 5: Diagram of the finally fitted two-compartment model.
From: Estimating immunity with mathematical models for SARS-CoV-2 after COVID-19 vaccination
Each parameter is defined as follows: \(k_{i21} = {\textstyle{{A_{i2}d_{i2} + C_{i2}b_{i2}} \over {A_{i2} + C_{i2}}}}\), \(A_{i2} = \exp \left( {a_{i2}} \right)\), \(C_{i2} = \exp \left( {c_{i2}} \right)\), \(k_{i10} = {\textstyle{{b_{i2}d_{i2}} \over {k_{i21}}}}\), and \(k_{i12} = b_{i2} + d_{i2} - k_{i21} - k_{i10}\).
