Cohort QA Before the Readout

“Can’t we just use one total metric for cohort QA checklist?” Your line A total can be the headline, but the cohort view tells us which starting group changed and what action should follow. Averaging away lifecycle stage. It acknowledges the stakeholder need while protecting the analytical principle. Classic retention vs conditional survival Never mix the two in one row without changing the label. What four words should appear in a cohort chart note? Start event, denominator, outcome, window. Those four details prevent most interpretation errors. COHORT What is the COHORT QA check?

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