Reference index / 행렬·시간·공간 밀도
Cohort Retention Heatmap
Shows retention by elapsed period for groups acquired at the same time.
When to use it
Use when designing matrices & density and selecting analytical visualizations.
Caveats and distinctions
Unobserved future periods are not zero retention.
Implementation and classification
데이터 시각화 / 행렬·시간·공간 밀도
Sources and verification status
https://vega.github.io/vega-lite/examples/
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