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The standard survival analysis model - for example the model which forms the basis for the proportional hazards model - assumes the hazard rate is constant. In many applications this would be the exception rather than the rule.

What parametric model would be appropriate for data such as this:

% retention
70%
80%
85%
90%
90%
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1 Answer 1

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In the Cox model, the hazard ratio between two levels is constant - not the hazard rate.

Anyways, most models will be able to model a decreasing hazard rate. The exception being exponential, which is constant over time.

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