Knowledge Base: How do you measure a project's vitality?

Vitality is calculated in this way:

((announcements * age) / (last_announcement))^(1/2)

The number of announcements a project has made is multiplied by the number of days it has existed in the database, which is then divided by the days passed since the last release. This way, projects with lots of announcements that have been around for a long time and have recently come out with a new release earn a high vitality score, and old projects that have only been announced once get a low vitality score.

The original implementation of the vitality score is courtesy of Walles <d92 dash jwa at nada dot kth dot se>.