This issue is to change how the new behavioural mechanism added in PR #129 works. The reduction in transmission rate is a function of the ratio of hospital occupancy and hospital capacity, so that there is a stronger reduction as hospital capacity is overwhelmed by demand.
This leads to the perverse-incentive outcome of more deaths at higher hospital capacities, when the behavioural mechanism is active (any $\delta > 0$). See the figure below.
The proposed fix is to make the reduction in transmission rate a function of hospital occupancy alone, which is similar to the 'old' behavioural mechanism. The responsiveness parameter $k_2$ will need to scaled down by 1-2 orders of magnitude to account for this change, as hospital occupancy or demand can be in the low millions for some infections.
This issue is to change how the new behavioural mechanism added in PR #129 works. The reduction in transmission rate is a function of the ratio of hospital occupancy and hospital capacity, so that there is a stronger reduction as hospital capacity is overwhelmed by demand.
This leads to the perverse-incentive outcome of more deaths at higher hospital capacities, when the behavioural mechanism is active (any$\delta > 0$ ). See the figure below.
The proposed fix is to make the reduction in transmission rate a function of hospital occupancy alone, which is similar to the 'old' behavioural mechanism. The responsiveness parameter$k_2$ will need to scaled down by 1-2 orders of magnitude to account for this change, as hospital occupancy or demand can be in the low millions for some infections.