If you are talking 'retention' than cohort analysis is what you are talking about. This analytical approach has been productized by all the top notch analytics vendors, recently GA. However, there are few marketers who are still unsure about cohort analysis and its applications. If you happen to be one of them, worry not and refer to this post. Check out use-cases and play with the Google sheet shared inside to get a hands-on experience of creating a cohort chart on your own.
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