Hazard multiplier
= Hazard multiplier
{title2=$\phi_i=e^{x_i^T\beta}$}
In a <proportional hazards model> $h_i(t)=h_0(t)\phi_i$, the <hazard multiplier> $\phi_i>0$ is the relative hazard against the reference multiplier one. In a <Cox proportional-hazards model> it is $e^{x_i^T\beta}$. Ratios of two time-constant multipliers give constant <hazard ratios>; time-dependent multipliers require a corresponding extension.