why would a schoenfeld residual be flat? what is the schoenfeld residual why is schoenfeld residual unflat why does the schoenfeld residual aren't flat why is schoenfeld residual flat why are schoenfeld residuals not flat what are schoenfeld residuals in a cox proportional hazards model why are schoenfeld residuals flat in cox proportional hazards does cox proportional hazards have flat residuals what is the schoenfeld residual schoenfeld residuals schoenfeld residuals definition which factor can schoenfeld residuals be flat what happens when schoenfeld residuals are not flat what do you do if the residuals are flat for one variable what if schoenfeld residuals are flat what is schoenfeld residuals what to do if schoenfeld residuals are not flat is scholenfeld residual flat is the schoenfeld residual flat