How can analytics tools help detect engagement decay?

Engagement decay is gradual reduction in recipient interaction over time. Analytics tools detect it through: trending analysis (declining open/click rates), cohort comparison (older subscribers vs newer), and individual activity tracking (time since last engagement).

Detection methods: calculate engagement rates by subscriber age cohort, track individual subscriber activity recency, identify inflection points where engagement drops, and correlate decay with sending frequency or content changes.

Detection enables action: implement re-engagement campaigns for decaying segments, adjust frequency for declining cohorts, sunset truly dormant subscribers, and analyze what sustains engagement in non-decaying groups. Early detection allows intervention before engagement fully collapses.