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Let Z represent a covariate. Assume that conditional on the covariate, the survival function is given by 1 S(t|Z) = t > 0. 1+

Let Z represent a covariate. Assume that conditional on the covariate, the survival function is given by 1 S(t|Z) = t > 0. 1+ exp(BZ)+1/2' Calculate the hazard function, h(t|Z), and show that this survival distribution model is not a proportional hazards model.

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