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The Stratified Cox Procedure - New Jersey Institute of ...
web.njit.eduThe “stratified Cox model” is a modification of the Cox proportional hazards (PH) model that allows for control by “stratification” of a predictor that does not satisfy the PH assumption. Predictors that are assumed to satisfy the PH assumption are included in the model, whereas the predictor be-ing stratified is not included.
A package for survival analysis in R
rdrr.iocoxph(y ˘offset(x1) + x2) { force in a known term, without estimating a coef- cient for it. cox.zph Computes a test of proportional hazards for the tted Cox model.
Enhancements to Proc PHReg for Survival Analysis in SAS 9
www.misug.orgCox Regression (cont’d) • The basic Cox Model assumes that the hazard functions for two different levels of a covariate are proportional for all values of t.