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The hazard rate is the instantaneous rate at which units that have survived until time $t$ die at $t$. The hazard ratio is the ratio of 2 specified hazards.

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Using two hazard ratios to make third comparison

Since hazard ratios are multiplicative we can use the natural logarithm $ln$ to make the calculation easier, i.e., $A/B$ becomes $ln(A)-ln(B)$. This will be relevant later on. …
Stefan Verweij's user avatar