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Is there a better way than stratification to do Cox regression for two variables, one qualitative and other quantitative, the qualitative (and more important one) violates an assumption of Cox regression

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    $\begingroup$ Do you mean that it violates the proportional hazards assumption? You can look into Cox models with time-dependent (or time-varying) coefficients. For example see here: Heinzl, H., & Kaider, A. (1997). Gaining more flexibility in Cox proportional hazards regression models with cubic spline functions. Computer methods and programs in biomedicine, 54(3), 201-208 $\endgroup$
    – boscovich
    Commented Jun 21, 2015 at 10:52

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