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The NRR comparability audit
A percentage earns comparison only after its construction survives the same six questions.
| Check | Yes means | No means |
|---|---|---|
| Same cohort rule | The starting populations are constructed the same way | The percentages are not directly comparable |
| Same revenue basis | Both measures use the same recurring revenue concept | Explain the boundary before comparing |
| Same window | The periods have the same length and timing | Seasonality may be part of the difference |
| Same currency treatment | Foreign exchange is handled consistently | Separate price, usage and currency effects |
| Same definition over time | The series has a stable meaning | Mark a break or restate the history |
| Same segment mix | The populations have a comparable distribution | Interpret the result as portfolio composition |
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Reference & Evidence
Source: Author's worksheet. Each row is a yes-or-no test before two retention percentages are compared.
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