Fig. 5.

The estimated nonparametric smooths of VCAP, average humidity, and imported cases from the GAM-V-MAX model. The smooth of imported cases indicates that the true relationship between the number of local infections and that of imported cases is linear. The smooth of VCAP indicates that for lower VCAP the number of local infections increases at a constant rate but after passing a threshold value of VCAP the rate begins to decrease. While the relationship with average humidity is not significant in most regions