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Extended Cox models, for example with time-dependent effects in which some of the regression coefficients change over time, do not satisfy the PH assumption and cannot be validated according to our scheme.
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"People change over time.
The symptoms can even change over time.
Diffusion coefficient changes, over time for different curing periods in tidal zone are presented in Fig. 3.
Others have changed over time as well.
This choice entails an assumption that the coefficients do not change over time and that the covariates influence the intensity function multiplicatively; alternatives such as the Aalen additive model, discussed below, use different assumptions.
The survey year coefficients capture the change over time since the omitted baseline year.
Baseline clinical and laboratory data showed no significant correlation coefficients versus fatigue change over time, except FSS difference versus mouth dryness VAS (rho = 0.21, P = 0.02).
The dynamic nature of DGLMs originates in the first-order Markovian evolution of the regression coefficients, which means that the coefficients are allowed to change over time.
Regression coefficients changed over different phases of rehabilitation.
The interaction coefficient picks up the change over time in the overeducation wage penalty.
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