Ratio Metrics [v5]
Ratio metrics are metrics that are defined as ratios. You can define ratio metrics for events occurring during a specified period time; when the numerator represents a subset of the denominator, the result is a percentage.
For example:
New users who signed up this week versus those who signed up last week.
Emails opened versus emails sent per month, on a rolling basis.
Users who consumed a particular resource after viewing a webpage, compared to all users who viewed the page.