The Entrepreneurship Opportunity in Egypt — 5: The Advertising Value Chain
Hell is just a sauna
Here is how I described it in my 1st article in the series:
The value chain in the real [Content Publishing] world…
So R — as in retained — are users who were traceable up to the point of examination but churned afterwards before the next point of examination, e.g. R8 are users who were visible up to day 8 but were no longer using the app at day 14. They may or may have not churned on days 9, 10, 11, 12 or 13.