4.14 Interpreting Poisson Regression
An increase in Xj by one unit is associated with a change in E(Y)=λ by a factor of exp(βj)
A change in weather from clear to cloudy skies is associated with a change in mean bike usage by a factor of
exp(-0.08) = 0.923
i.e. on average, only 92.3% as many people will use bikes compared to when it is clear (baseline weather).