Engineering brief

Dot Plots Expose What Aggregate Analytics Hide

Y Combinator1 min read · saves 13 min

At a glance

Relevance
Practical value
Warnings
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Dot plots—a user×day grid of value events—reveal behavioral patterns that aggregate metrics like DAU conceal. For instance, one B2B customer churned after only 3 of 10 seats activated, a red flag a dot plot would have surfaced months earlier.

It reveals actual user engagement patterns that aggregate metrics hide, preventing churn and guiding feature priorities.

Summary

Most startups over-rely on aggregate metrics like DAU, which obscure how individuals actually engage. Dot plots—a simple user×day grid marking value events—force teams to see real behavior. This lightweight method scales from 10 users to billions, exposing patterns dashboards miss.

A real B2B case: a high-value customer churned after only 3 of 10 seats ever activated; a dot plot would have flagged the shallow usage months earlier. It turns logs into pattern recognition, highlighting things like weekday vs. weekend usage or feature-driven retention.

Missteps include tracking vanity events (e.g., 'opened app') or using too-wide time buckets, creating false comfort. The right event must represent real value. Until hundreds of users, dot plots can replace entire dashboards, complementing cohort analysis.

Implementation is trivial: parse logs into a 2D grid, doable with modern AI tools. The real work is deciding what to measure and training teams to read patterns. Engineering leaders get a cheap, high-signal addition to their analytics stack.

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