Choose a cohort heatmap when the comparison is retention decay across start cohorts and elapsed periods.
Product retention review after an onboarding redesign. Leila needs the VP to see whether newer signup cohorts retain better across the first weeks. Which visual should lead? A cohort heatmap with signup cohorts as rows, weeks since signup as columns, and one sequential color scale. Right. The grid preserves both ordered dimensions, and controlled color contrast lets the eye scan decay and cohort differences quickly. One overall retention line that blends all signup months into a single trend. Too compressed for the question. It can show an overall trend, but it hides which signup cohorts improved or faded. A pie…
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