Journal

Notes on measuring things.

Field notes from the people building Ether. Measurement models, retention reading, automation practice and the pipes underneath.


Written by the people doing the work

Metric library

Definitions worth stealing.

Opinionated starting definitions. Copy them into your workspace and argue from there. They come from the same three people who write here, and who are introduced on the about page.

Activation
The first product action that separates 90-day retention by 15 points or more.
Net revenue retention
Expansion minus contraction and churn, over a fixed cohort, trailing 12 months.
Time to first value
Signup to the first action a second person in the account benefits from.
Gross churn
Revenue lost from cancellations and downgrades, excluding involuntary failures.
Signal to noise
Alerts that led to an action, over alerts fired. Below 0.3 means retune.

Each of these is a real metric type in the product. See how they are defined.