Does The Selection of Covariates in The Cox Regression Model Matter

Abstract

Cox proportional hazards regression model (CPHRM) has been famous as a method for clinical data analysis. However, its controversies is still discussed by those who found of accelerated life in dealing with survival analysis. Here, the question is proposed and opened to the reader whether the determination of covariates in the CPHRMbe reviewed again? Especially covariates 0 and 1 which Cox used it to his spectacular CPHRM for two-sample.