interprétation régression de cox


What is the Cox proportional-hazards regression model?

    TheCox proportional-hazards regression model is the most common tool for studying thedependency of survival time on predictor variables. This appendix to Fox and Weisberg (2019)briey describes the basis for the Cox regression model, and explains how to use thesurvivalpackage inRto estimate Cox regressions.

What is stratied Cox regression model?

    stratied Cox regression model is t by including a call to thestrata()function on the right-hand side of the model formula. The arguments to this function are one or more stratifying variables;if there is more than one such variable, then the strata are formed from their cross-classication.

Is Cox PH a semiparametric model?

    is a semiparametric model makes no assumptions about the form of assumes parametric form for the e?ect of the predictors onthe hazard In most situations, we are more interested in the parameterestimates than the shape of the hazard. The Cox PH model iswell-suited to this goal. {Xi??log[ exp(Xj?)}]

How does the Cox ZPH function work?

    More conveniently, thecox.zph()function calculates tests of the proportional-hazardsassumption for each covariate, by correlating the corresponding set of scaled Schoenfeld residualswith a suitable transformation of time [the default is based on theKaplan-Meier estimateof thesurvival function, K(t)].
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