Cohort Retention Rate Calculation

This task enables data analysts to calculate cohort-based retention rates using native Excel formulas. By grouping users or customers by start period and tracking active status, analysts can identify behavioral trends over time. The approach is widely used in product analytics, HR analytics, and customer success reporting. It avoids complex macros while remaining flexible and transparent. Analysts can extend it to multi-period retention curves or visualize results in dashboards. The method supports data-driven strategy discussions with clear, defensible metrics.