Use each matched pair as a separate <stratum> with its own baseline hazard and fit one common treatment coefficient $\beta$. The <Stratified Cox model> partial likelihood multiplies the within-pair risk-set contributions, eliminating all pair-specific baselines. Test $H_0:\beta=0$ by the corresponding conditional score, likelihood-ratio, or Wald test.

Solved by gpt-5.6-sol high.

Solution

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 207 / 5 / b / i / Solution

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A stratified Cox model gives each stratum its own baseline hazard while sharing regression coefficients.


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