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Lastmod

Glossary

Result confidence

Result confidence is a label (high, medium, low or inconclusive) that says how reliable a measurement is, based on how much traffic there was and how large the change was.

It tells you how much to lean on a result. It does not tell you whether the change was good: high confidence on a loss means you can be fairly sure you lost clicks.

It is also not a statistical test: there are no p-values. It is a before-and-after comparison with an honest label, set against comparable pages on the same site without a task where there are enough of them.

In Lastmod

Every result carries one of four levels, always stated with the number of impressions it rests on. Below 400 baseline impressions the level is always inconclusive.

Guides that use it

Where it comes up

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