The goal of this issue is to define a Retention Analysis report for Piwik. Retention analysis is sometimes called Cohorts and is a powerful analysis technique.

Quote:

There are few issues more important than customer retention when running software-as-a-service businesses.

Resources

• Retention Analysis the Right Way
• Cohort Analysis - Measuring Engagement over time
• Cohort analysis with GA
• Performing cohort analyses with Snowplow

Cohort analysis report

Cohort analysis report will allow to analyse the following metrics over time (by day, week, month based on Piwik date selector):

• retention % (% users that signed in = % users for which we recorded a visit),
• retention (number of users that signed in = number of users for which we recorded a visit),
• revenue (value of in-app purchases = value of ecommerce conversions)
• conversion rate (% users that made an in-app purchase = % users with ecommerce conversion)
• event X where X can be any event name tracked (% users that triggered the event X)

•    i.e. level ups, items used, gifts sent etc. 
  

by the following cohorts:

• sign up date (first visit in Piwik for particular user),
• last sign in (last visit in Piwik for particular user),
• last purchase (last e-commerce conversion in Piwik for particular user),
• first purchase (first e-commerce conversion in Piwik for particular user).

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