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Cox proportional hazards regression is a semi-parametric method for survival analysis. No distributional form needs to be assumed, only that the effect of one-unit increase in a covariate is a constant multiple.

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In my opinion, Yuval nails it quite well. If you want to get the exact (scaled) Schoenfeld residuals for all covariates, access them from the viol .zph object like that: viol$y and viol$x gives y …
answered Jan 12 '18 by Jann Goschenhofer
1
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On page 228 in this book on Survival Analysis by Liu et. al. the formula for the scaled Schoenfeld residual for observation i and covariable m is described as: $$ r_{im}^{\text{scaled schoen}} = \fr …
answered Jan 12 '18 by Jann Goschenhofer